sphinxdocs: remove local rules_python dev overrides (bazel-contrib#3705)

In the BCR integration test, the local override breaks on BCR itself
because a local copy of rules_python isn't part of the test
environment.

Remove it from the sphinxdocs module, too, because it shouldn't
be necessary. The two aren't that closely coupled.

(cherry picked from commit c33ba23)

Author: rickeylev

sphinxdocs/MODULE.bazel

@@ -9,10 +9,6 @@ bazel_dep(name = "stardoc", version = "0.7.2", repo_name = "io_bazel_stardoc")
 bazel_dep(name = "platforms", version = "0.0.11")
 bazel_dep(name = "protobuf", version = "29.0-rc2", repo_name = "com_google_protobuf")
 bazel_dep(name = "rules_python", version = "1.8.5")
-local_path_override(
-    module_name = "rules_python",
-    path = "..",
-)
 
 dev_pip = use_extension(
     "@rules_python//python/extensions:pip.bzl",

sphinxdocs/integration_tests/bcr/MODULE.bazel

@@ -9,11 +9,7 @@ local_path_override(
     path = "../..",
 )
 
-bazel_dep(name = "rules_python", version = "0.0.0")
-local_path_override(
-    module_name = "rules_python",
-    path = "../../..",
-)
+bazel_dep(name = "rules_python", version = "1.8.5")
 
 dev_pip = use_extension(
     "@rules_python//python/extensions:pip.bzl",