Update workflow deps

Author: dmtucker

.github/workflows/publication.yaml

@@ -6,8 +6,8 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v6
+    - uses: actions/setup-python@v6
       with:
         python-version: '3.8'
     - run: python -m pip install --upgrade tox-gh-actions

.github/workflows/validation.yaml

@@ -7,8 +7,8 @@ jobs:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v6
+    - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
     - run: python -m pip install --upgrade tox-gh-actions