ci: bump actions to v6 for Node.js 24 support

- actions/checkout v4 → v6
- actions/setup-python v5 → v6
- Remove FORCE_JAVASCRIPT_ACTIONS_TO_NODE24 workaround (no longer needed)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jgamblin

.github/workflows/ci.yml

@@ -6,9 +6,6 @@ on:
   pull_request:
     branches: [main]
 
-env:
-  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
-
 jobs:
   test:
     runs-on: ${{ matrix.os }}
@@ -17,8 +14,8 @@ jobs:
         os: [macos-14, macos-15]
         python-version: ["3.10", "3.11", "3.12"]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - run: pip install -e ".[dev]"
@@ -29,8 +26,8 @@ jobs:
   lint:
     runs-on: macos-14
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - run: pip install -e ".[dev]"

.github/workflows/release.yml

@@ -8,8 +8,8 @@ jobs:
   release:
     runs-on: macos-14
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - run: pip install -e ".[dev]"