Bump sigstore/cosign-installer from 3.1.1 to 3.1.2 in /setup-bom

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@6e04d22...11086d2)

---
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>

setup-bom/action.yml

@@ -35,7 +35,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06 # v3.1.1
+    - uses: sigstore/cosign-installer@11086d25041f77fe8fe7b9ea4e48e3b9192b8f19 # v3.1.2
       with:
         install-dir: ${{ inputs.install-dir }}
         use-sudo: ${{ inputs.use-sudo }}