add note about the readthedocs go version requirement

The versions should be kept in sync to avoid build errors on readthedocs
later, so add a note to remind people to update them.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

.readthedocs.yaml

@@ -9,6 +9,7 @@ build:
   os: ubuntu-26.04
   tools:
     python: "3.14"
+    # Note this must be at least the go version from test/tools/go.mod in order to be able to build swagger.
     golang: "1.25"
   jobs:
     pre_build:

test/tools/go.mod

@@ -3,6 +3,7 @@ module go.podman.io/podman/test/tools
 // Warning: if there is a "toolchain" directive anywhere in this file (and most of the
 // time there shouldn't be), its version must be an exact match to the "go" directive.
 
+// Important when updating the version here also update it in .readthedocs.yaml
 go 1.25.0
 
 require (