chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/fossa.yml

@@ -13,7 +13,7 @@ jobs:
     if: ${{ github.repository == 'open-telemetry/opentelemetry-ruby' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
       - name: Install Ruby 3.4
         uses: ruby/[email protected]

.github/workflows/ossf-scorecard.yml

@@ -20,7 +20,7 @@ jobs:
       # Needed for GitHub OIDC token if publish_results is true
       id-token: write
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false