Bump action-translation to v0.16.0

Moves the review and rebase workflows onto v0.16.0, whose default model is
claude-sonnet-5 (v0.15.0 defaulted to claude-sonnet-4-6).

Scope note: these two workflows are review and rebase mode only. Translation for
this edition runs from the English source repo, which does not yet have a
sync-translations-fr.yml — so this does not change how French lectures are
translated. See QuantEcon/lecture-python-programming for that.

Author: mmcky

.github/workflows/rebase-translations.yml

@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Rebase open translation PRs
-        uses: QuantEcon/action-translation@v0.15.0
+        uses: QuantEcon/action-translation@v0.16.0
         with:
           mode: rebase
           anthropic-api-key: ${{ secrets.ANTHROPIC_API_KEY }}

.github/workflows/review-translations.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           fetch-depth: 2
 
-      - uses: QuantEcon/action-translation@v0.15.0
+      - uses: QuantEcon/action-translation@v0.16.0
         with:
           mode: review
           source-repo: QuantEcon/lecture-python-programming