i18n: pin docutils back to 0.22.4 (myst-parser 5.1.0 requires <0.23)

The docutils 0.23 bump conflicts with myst-parser==5.1.0, which requires
docutils>=0.20,<0.23, making the i18n venv unresolvable and breaking the
translation template extraction job.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

i18n/requirements.txt

@@ -3,7 +3,7 @@ babel==2.18.0
 certifi==2026.6.17
 charset-normalizer==3.4.7
 click==8.4.2
-docutils==0.23
+docutils==0.22.4
 idna==3.18
 imagesize==2.0.0
 Jinja2==3.1.6