Update to cosign v2.4.0 (#220)

The v2.4.0 release contains modernizations and some bug fixes from
previous releases. Let's keep our builder up-to-date.

Author: agners

action.yml

@@ -15,7 +15,7 @@ runs:
     - name: Install Cosign
       uses: sigstore/cosign-installer@v3.6.0
       with:
-        cosign-release: "v2.2.3"
+        cosign-release: "v2.4.0"
 
     - shell: bash
       id: version

build.yaml

@@ -10,7 +10,7 @@ cosign:
   identity: https://github.com/home-assistant/builder/.*
 args:
   YQ_VERSION: "v4.13.2"
-  COSIGN_VERSION: "2.2.3"
+  COSIGN_VERSION: "2.4.0"
 labels:
   io.hass.type: builder
   org.opencontainers.image.title: "Home Assistant Builder"