Bump chainguard-dev/actions from 1.5.14 to 1.5.15 in /gofmt (#723)

Bumps [chainguard-dev/actions](https://github.com/chainguard-dev/actions) from 1.5.14 to 1.5.15.
- [Release notes](https://github.com/chainguard-dev/actions/releases)
- [Commits](fac81f8...6f74cde)

---
updated-dependencies:
- dependency-name: chainguard-dev/actions
  dependency-version: 1.5.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gofmt/action.yaml

@@ -57,6 +57,6 @@ runs:
       done
 
   - name: Verify gofmt
-    uses: chainguard-dev/actions/nodiff@fac81f8edade777ac0bedfa9f4a42591accab9c8 # v1.5.14
+    uses: chainguard-dev/actions/nodiff@6f74cdeee55d70b03fa220746d6739dbbb3e9421 # v1.5.15
     with:
       fixup-command: "gofmt ${{ inputs.args }}"