MAINT: Bump actions/checkout from 5 to 6 (#670)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: pyansys-ci-bot <[email protected]>

Author: dependabot[bot]

.github/workflows/ci_cd.yml

@@ -70,7 +70,7 @@ jobs:
         python-version: [ '3.10', '3.11', '3.12', '3.13' ]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6

.github/workflows/label.yml

@@ -20,7 +20,7 @@ jobs:
     name: Syncer
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: micnncim/action-label-syncer@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

doc/changelog.d/670.miscellaneous.md

@@ -0,0 +1 @@
+Ci: Bump actions/checkout from 5 to 6