bump Go version to 1.18

Signed-off-by: Madhav Jivrajani <[email protected]>

Author: MadhavJivrajani

.github/workflows/audit.yaml

@@ -14,7 +14,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.17
+          go-version: 1.18.1
 
       - name: Set env
         shell: bash

go.mod

@@ -1,6 +1,6 @@
 module github.com/kubernetes-sigs/maintainers
 
-go 1.17
+go 1.18
 
 require (
 	github.com/pkg/errors v0.9.1