chore(ci): Pin GitHub Actions to commit SHAs

Pin GitHub Actions references to full commit SHAs instead of version
tags to reduce supply chain risk from tag retargeting.

Update actions/checkout to v6.0.2, actions/setup-python to v6.2.0,
actions/setup-node to v6.3.0, actions/stale to v10.2.0, and
dessant/lock-threads to v6.0.0.

.github/workflows/close-incomplete-issues.yml

@@ -15,7 +15,7 @@ jobs:
     if: github.repository == 'netbox-community/netbox'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v9
+      - uses: actions/stale@b5d41d4e1d5dceea10e7104786b73624c18a190f # v10.2.0
         with:
           close-issue-message: >
             This issue is being closed as no further information has been provided. If