minor #18148 Use Doctor RST 1.42.1 and new Rule ForbiddenDirectives (alamirault)

This PR was squashed before being merged into the 5.4 branch.

Discussion
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Use Doctor RST 1.42.1 and new Rule `ForbiddenDirectives`

Example when .rst is ko:

https://github.com/alamirault/symfony-docs/actions/runs/4567267701/jobs/8060843021

Commits
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5f0a2e8 Use Doctor RST 1.42.1 and new Rule `ForbiddenDirectives`

Author: OskarStark

.doctor-rst.yaml

@@ -18,6 +18,9 @@ rules:
     ensure_order_of_code_blocks_in_configuration_block: ~
     extend_abstract_controller: ~
     extension_xlf_instead_of_xliff: ~
+    forbidden_directives:
+        directives:
+            - '.. index::'
     indention: ~
     lowercase_as_in_use_statements: ~
     max_blank_lines:

.github/workflows/ci.yaml

@@ -73,7 +73,7 @@ jobs:
                     key: ${{ runner.os }}-doctor-rst-${{ steps.extract_base_branch.outputs.branch }}
 
             -   name: "Run DOCtor-RST"
-                uses: docker://oskarstark/doctor-rst:1.41.3
+                uses: docker://oskarstark/doctor-rst:1.42.1
                 with:
                     args: --short --error-format=github --cache-file=/github/workspace/.cache/doctor-rst.cache