.github/workflows: bump actions/*

Node.js 20 actions are deprecated.

See-also: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/
See-also: https://github.com/actions/checkout
See-also: https://github.com/actions/setup-python
Signed-off-by: Florian Albrechtskirchinger <falbrechtskirchinger@gmail.com>

.github/workflows/duplicates.yml

@@ -27,7 +27,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: dev
       - name: Setup master gentoo repository

.github/workflows/emails.yml

@@ -17,12 +17,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.x
 
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/pkgcheck.yml

@@ -26,7 +26,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: dev
       - name: Run pkgcheck