Bugfix: restore `score_plantuml` extension in `docs/conf.py`

[arkjedrz]

bazel build //... cannot be run when score_plantuml extension is defined by docs/conf.py

[PiotrKorkus]

Traceback (most recent call last):
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python+/sphinxdocs/private/sphinx_build.py", line 215, in _worker_main
    return worker.run()
           ^^^^^^^^^^^^
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python+/sphinxdocs/private/sphinx_build.py", line 75, in run
    response = self._process_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python+/sphinxdocs/private/sphinx_build.py", line 164, in _process_request
    exit_code = main(sphinx_args)
                ^^^^^^^^^^^^^^^^^
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python++pip+pip_process_312_sphinx/site-packages/sphinx/cmd/build.py", line 493, in main
    return build_main(argv)
           ^^^^^^^^^^^^^^^^
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python++pip+pip_process_312_sphinx/site-packages/sphinx/cmd/build.py", line 414, in build_main
    app = Sphinx(
          ^^^^^^^
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python++pip+pip_process_312_sphinx/site-packages/sphinx/application.py", line 291, in __init__
    self.setup_extension(extension)
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python++pip+pip_process_312_sphinx/site-packages/sphinx/application.py", line 489, in setup_extension
    self.registry.load_extension(self, extname)
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python++pip+pip_process_312_sphinx/site-packages/sphinx/registry.py", line 560, in load_extension
    metadata = setup(app)
               ^^^^^^^^^^
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/score_docs_as_code+/src/extensions/score_plantuml.py", line 90, in setup
    app.config.plantuml = str(find_correct_path(get_runfiles_dir()))
                                                ^^^^^^^^^^^^^^^^^^
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/score_docs_as_code+/src/extensions/score_plantuml.py", line 64, in get_runfiles_dir
    sys.exit(
SystemExit: Could not find runfiles_dir at /home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-bin/ide_support.runfiles. Have a look at README.md for instructions on how to build docs.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python+/sphinxdocs/private/sphinx_build.py", line 233, in <module>
    sys.exit(_worker_main(sys.stdin, sys.stdout, os.getcwd()))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pko/.cache/bazel/_bazel_pko/3c6e3ebec6d1f13bc4ad8e79f49ea7cf/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build.runfiles/rules_python+/sphinxdocs/private/sphinx_build.py", line 214, in _worker_main
    with Worker(stdin, stdout, exec_root) as worker:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Worker.__exit__() takes 1 positional argument but 4 were given