Fix lint action

Author: jaimeyh

.github/workflows/golangci-lint.yml

@@ -20,11 +20,11 @@ jobs:
       - name: install Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.18.x
+          go-version: 1.21.x
       - name: Install snmp_exporter/generator dependencies
         run: sudo apt-get update && sudo apt-get -y install libsnmp-dev
         if: github.repository == 'prometheus/snmp_exporter'
       - name: Lint
-        uses: golangci/golangci-lint-action@v3.2.0
+        uses: golangci/golangci-lint-action@v6.1.0
         with:
-          version: v1.45.2
+          version: v1.60.3