Upgrade workflows

Author: cschleiden

.github/workflows/bench.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: 1.19
+          go-version: 1.21
           check-latest: true
           cache: true
 

.github/workflows/go.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v3
       with:
-        go-version: 1.19
+        go-version: 1.21
         check-latest: true
         cache: true