chore(deps): update actions/attest action to v4.2.0 (#411)

Author: renovate[bot]

.github/workflows/manual-publish.yml

@@ -56,6 +56,6 @@ jobs:
 
       - name: Attest build provenance
         if: ${{ format('{0}', inputs.dry_run) == 'false' }}
-        uses: actions/attest@a1948c3f048ba23858d222213b7c278aabede763 # v4.1.1
+        uses: actions/attest@f7c74d28b9d84cb8768d0b8ca14a4bac6ef463e6 # v4.2.0
         with:
           subject-path: 'launchdarkly-server-sdk-*.gem'

.github/workflows/release-please.yml

@@ -70,6 +70,6 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Attest build provenance
-        uses: actions/attest@a1948c3f048ba23858d222213b7c278aabede763 # v4.1.1
+        uses: actions/attest@f7c74d28b9d84cb8768d0b8ca14a4bac6ef463e6 # v4.2.0
         with:
           subject-path: 'launchdarkly-server-sdk-*.gem'