Bump go version in benchmarks

Signed-off-by: Tomasz Pietrek <tomasz@nats.io>

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4 # v4 uses caching of Go out of the box
         with:
-          go-version: '1.20'
+          go-version: '1.22'
       - name: Install nats-server
         run: go install github.com/nats-io/nats-server/v2@main