Update actions/checkout action to v6

Update actions/checkout from v4 to v6

Change-type: patch

Author: balena-renovate[bot]

.github/workflows/meta-balena-esr.yml

@@ -50,7 +50,7 @@ jobs:
           repositories: >
             ["${{ github.event.repository.name }}"]
 
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
         with:
           # The default GITHUB_TOKEN does not have workflow scope
           # This is needed to push a new branch with workflow files

.github/workflows/update-backports.yml

@@ -38,7 +38,7 @@ jobs:
           repositories: >
             ["${{ github.event.repository.name }}"]
 
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
         with:
           # The default GITHUB_TOKEN does not have workflow scope
           # This is needed to push a new branch with workflow files