Bump sigstore/cosign-installer from 3.0.2 to 3.0.3 (#297)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@9e9de22...204a51a)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  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>

.github/workflows/release.yml

@@ -30,7 +30,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go-
 
-      - uses: sigstore/cosign-installer@9e9de2292db7abb3f51b7f4808d98f0d347a8919 # v3.0.2
+      - uses: sigstore/cosign-installer@204a51a57a74d190b284a0ce69b44bc37201f343 # v3.0.3
         with:
           cosign-release: 'v2.0.0' # optional
       - uses: anchore/sbom-action/download-syft@422cb34a0f8b599678c41b21163ea6088edb2624 # v0.14.1

.github/workflows/validate-release.yml

@@ -25,7 +25,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go-
 
-      - uses: sigstore/cosign-installer@9e9de2292db7abb3f51b7f4808d98f0d347a8919 # v3.0.2
+      - uses: sigstore/cosign-installer@204a51a57a74d190b284a0ce69b44bc37201f343 # v3.0.3
         with:
           cosign-release: 'v2.0.0' # optional
       - uses: anchore/sbom-action/download-syft@422cb34a0f8b599678c41b21163ea6088edb2624 # v0.14.1