Update go version for using fulcio

Signed-off-by: Appu Goundan <[email protected]>

Author: loosebazooka

.github/workflows/ci.yaml

@@ -45,7 +45,7 @@ jobs:
     - name: Setup Go environment
       uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
       with:
-        go-version: '1.19.x'
+        go-version: '1.21.x'
 
     # at some point this should just be replaced with something that can bring up a sigstore test env
     - name: Install Fulcio