Import upstream Python 3.14.3 release

Summary:
Imported python/cpython `3.14.3` from upstream rev [`323c59a`](https://www.github.com/python/cpython/commit/323c59a5e348347be2ce2b7ea55fcb30bf68b2d3) (committed 2026-02-03 15:31:53+00:00).

# Commit Info

Base: (`3.14.2`) - [`df79316`](https://www.github.com/python/cpython/commit/df793163d5821791d4e7caf88885a2c11a107986) (commit date: 2025-12-05 16:49:01+00:00)
Imported: (`3.14.3`) - [`323c59a`](https://www.github.com/python/cpython/commit/323c59a5e348347be2ce2b7ea55fcb30bf68b2d3) (commit date: 2026-02-03 15:31:53+00:00)

# Files added

```
.github/workflows/reusable-cifuzz.yml
Doc/deprecations/pending-removal-in-3.18.rst
Lib/pydoc_data/module_docs.py
Lib/test/NormalizationTest-3.2.0.txt
Lib/test/mp_preload_sysargv.py
Lib/test/picklecommon.py
Lib/test/test_xpickle.py
Lib/test/xpickle_worker.py
Misc/NEWS.d/3.14.3.rst
Tools/check-c-api-docs/mypy.ini
```

Reviewed By: fried

Differential Revision: D92304963

fbshipit-source-id: 6ccb0fd32efbbc95c1de094f04aca49b19d60029

Author: itamaro

.gitattributes

@@ -82,8 +82,10 @@ Include/opcode.h                                    generated
 Include/opcode_ids.h                                generated
 Include/token.h                                     generated
 Lib/_opcode_metadata.py                             generated
-Lib/keyword.py                                      generated
 Lib/idlelib/help.html                               generated
+Lib/keyword.py                                      generated
+Lib/pydoc_data/topics.py                            generated
+Lib/pydoc_data/module_docs.py                       generated
 Lib/test/certdata/*.pem                             generated
 Lib/test/certdata/*.0                               generated
 Lib/test/levenshtein_examples.json                  generated

.github/CODEOWNERS

@@ -5,7 +5,7 @@
 # https://git-scm.com/docs/gitignore#_pattern_format
 
 # GitHub
-.github/**                    @ezio-melotti @hugovk @AA-Turner
+.github/**                    @ezio-melotti @hugovk @AA-Turner @webknjaz
 
 # pre-commit
 .pre-commit-config.yaml       @hugovk

.github/workflows/add-issue-header.yml

@@ -20,7 +20,7 @@ jobs:
       issues: write
     timeout-minutes: 5
     steps:
-      - uses: actions/github-script@v7
+      - uses: actions/github-script@v8
         with:
           # language=JavaScript
           script: |