gateway: bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/codeql-analysis.yml

@@ -47,7 +47,7 @@ jobs:
       security-events: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: false
 

.github/workflows/linting.yml

@@ -12,7 +12,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
 

.github/workflows/pelican-action-test.yml

@@ -20,14 +20,14 @@ jobs:
       group: testsite-${{ github.ref_name }} # must agree with TARGET
     steps:
       - name: Checkout the test site
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.SOURCE }}
       - name: Ignore the action checkout
         run: |
           echo "self/" >> .git/info/exclude
       - name: Checkout self
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: self
       - name: Reset output directory ${{ env.TARGET }}

.github/workflows/pytest.yml

@@ -28,7 +28,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
 

.github/workflows/remove_expired.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: true
           # Use PAT so the commit triggers other actions

.github/workflows/stash-action-test.yml

@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     container: quay.io/centos/centos:stream8
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Run action
         continue-on-error: true
@@ -58,7 +58,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-15-intel, macos-14]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Run unittests
         shell: bash
@@ -135,7 +135,7 @@ jobs:
     needs: test-save
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Test intra-workflow stash
         uses: ./stash/restore

.github/workflows/update_actions.yml

@@ -25,7 +25,7 @@ jobs:
       contents: write
     steps:
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: true
 

.github/workflows/update_dummy.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: true
           # We have to use a PAT to commit the workflow file