Building documentation fails with Bazel 6

[ylecornec]

Building documentation targets from the docs directory with Bazel 6 fails with the following error:

./external/bazel_tools/tools/cpp/cc_configure.bzl:194:26: name 'module_extension' is not defined
com.google.devtools.build.skydoc.SkydocMain$StarlarkEvaluationException: name 'module_extension' is not defined
	at com.google.devtools.build.skydoc.SkydocMain.recursiveEval(SkydocMain.java:393)
	at com.google.devtools.build.skydoc.SkydocMain.recursiveEval(SkydocMain.java:402)
	at com.google.devtools.build.skydoc.SkydocMain.recursiveEval(SkydocMain.java:402)
	at com.google.devtools.build.skydoc.SkydocMain.eval(SkydocMain.java:260)
	at com.google.devtools.build.skydoc.SkydocMain.main(SkydocMain.java:163)
Stardoc documentation generation failed: name 'module_extension' is not defined

It seems that stardoc fails to parse files from @bazel_tools which use the recent module_extension feature.

See this similar issue: bazelbuild/stardoc#123

[ylecornec]

This seems to be fixed by updating stardoc to version 0.5.3