chore: update default cosign-release to v3.0.5 (#223)

Aligns the default cosign-release input with the bootstrap version.

Signed-off-by: rsclarke <hey@rsclarke.dev>

Author: rsclarke

action.yml

@@ -10,7 +10,7 @@ inputs:
   cosign-release:
     description: 'cosign release version to be installed'
     required: false
-    default: 'v3.0.3'
+    default: 'v3.0.5'
   install-dir:
     description: 'Where to install the cosign binary'
     required: false