make cosign v2.0.0 default version (#109)

Signed-off-by: Batuhan Apaydın <[email protected]>

Author: developer-guy

action.yml

@@ -10,7 +10,7 @@ inputs:
   cosign-release:
     description: 'cosign release version to be installed'
     required: false
-    default: 'v1.13.1'
+    default: 'v2.0.0'
   install-dir:
     description: 'Where to install the cosign binary'
     required: false