chore(deps): update Cosign version to v3.1.2

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: docker-ghbuilder[bot]

.github/workflows/bake.yml

@@ -184,7 +184,7 @@ env:
     --prefer-offline
     --fund=false
     --audit=false
-  COSIGN_VERSION: "v3.0.6"
+  COSIGN_VERSION: "v3.1.2"
   LOCAL_EXPORT_DIR: "/tmp/buildx-output"
   MATRIX_SIZE_LIMIT: "20"
   BUILDX_METADATA_PROVENANCE: "false"

.github/workflows/build.yml

@@ -195,7 +195,7 @@ env:
     --prefer-offline
     --fund=false
     --audit=false
-  COSIGN_VERSION: "v3.0.6"
+  COSIGN_VERSION: "v3.1.2"
   LOCAL_EXPORT_DIR: "/tmp/buildx-output"
   MATRIX_SIZE_LIMIT: "20"
   BUILDX_METADATA_PROVENANCE: "false"