GH Actions: bump Go to 1.22 (was 1.21)

See https://tip.golang.org/doc/go1.22

.github/workflows/go.yml

@@ -13,10 +13,10 @@ jobs:
 
       - uses: actions/checkout@v4
 
-      - name: Set up Go 1.21
+      - name: Set up Go 1.22
         uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.22'
 
       - run: go mod download
 
@@ -30,9 +30,10 @@ jobs:
 
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-go@v5
+      - name: Set up Go 1.22
+        uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.22'
 
       - run: go mod download