fix(android): Check in material-stepper as internal dependency

Follows this guide on [setting up a local maven respository](https://brightinventions.pl/blog/migrating-away-from-bintray-jcenter-when-there-is-no-alternative-repository/#setting-up-a-local-maven-repository) now that jcenter is deprecated.

android/KMAPro/build.gradle

@@ -2,8 +2,12 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        //jcenter() deprecated August 2024
+        mavenLocal()
         mavenCentral()
+        flatDir {
+            dirs "kMAPro/libs/com/stepstone/stepper/material-stepper/4.3.1/"
+        }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:7.4.2'
@@ -13,14 +17,15 @@ buildscript {
 
         // From jcenter() which could be sunset in future
         // https://jfrog.com/blog/into-the-sunset-bintray-jcenter-gocenter-and-chartcenter/
-        classpath 'com.stepstone.stepper:material-stepper:4.3.1'
+        classpath 'com.stepstone.stepper:material-stepper:4.3.1@aar'
     }
 }
 
 allprojects {
     repositories {
+        maven { url uri("${projectDir}/libs") }
         google()
-        jcenter()
+        //jcenter() deprecated August 2024
         mavenCentral()
         maven { url "https://jitpack.io" }
     }

android/KMAPro/kMAPro/build.gradle

@@ -145,7 +145,7 @@ repositories {
         dirs 'libs'
     }
     google()
-    jcenter()
+    //jcenter()
 }
 
 dependencies {

android/KMAPro/kMAPro/libs/com/stepstone/stepper/material-stepper/4.3.1/material-stepper-4.3.1.pom

@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.stepstone.stepper</groupId>
+  <artifactId>material-stepper</artifactId>
+  <version>4.3.1</version>
+  <packaging>aar</packaging>
+  <name>Android Material Stepper</name>
+  <description>This library allows to use Material steppers inside Android applications.</description>
+  <url>https://github.com/stepstone-tech/android-material-stepper</url>
+  <licenses>
+    <license>
+      <name>The Apache Software License, Version 2.0</name>
+      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
+  <developers>
+    <developer>
+      <id>zawadz88</id>
+      <name>Piotr Zawadzki</name>
+      <email>piotr.zawadzki@stepstone.com</email>
+    </developer>
+  </developers>
+  <scm>
+    <connection>https://github.com/stepstone-tech/android-material-stepper.git</connection>
+    <developerConnection>https://github.com/stepstone-tech/android-material-stepper.git</developerConnection>
+    <url>https://github.com/stepstone-tech/android-material-stepper</url>
+  </scm>
+  <dependencies>
+    <dependency>
+      <groupId>com.android.support</groupId>
+      <artifactId>appcompat-v7</artifactId>
+      <version>25.4.0</version>
+      <scope>compile</scope>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <version>2.7.21</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.squareup.assertj</groupId>
+      <artifactId>assertj-android</artifactId>
+      <version>1.1.1</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.robolectric</groupId>
+      <artifactId>robolectric</artifactId>
+      <version>3.3.1</version>
+      <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <artifactId>httpclient</artifactId>
+          <groupId>org.apache.httpcomponents</groupId>
+        </exclusion>
+        <exclusion>
+          <artifactId>commons-logging</artifactId>
+          <groupId>commons-logging</groupId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>org.jetbrains.kotlin</groupId>
+      <artifactId>kotlin-stdlib-jre7</artifactId>
+      <version>1.1.4-3</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.jetbrains.kotlin</groupId>
+      <artifactId>kotlin-reflect</artifactId>
+      <version>1.1.4-3</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.nhaarman</groupId>
+      <artifactId>mockito-kotlin</artifactId>
+      <version>1.4.0</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>