chore: Update Go to 1.19

Author: TwiN

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v3
         with:
-          go-version: 1.18
+          go-version: 1.19
       - uses: actions/checkout@v3
       - run: go build
       - run: go test ./... -cover

go.mod

@@ -1,6 +1,6 @@
 module github.com/TwiN/k8s-ttl-controller
 
-go 1.18
+go 1.19
 
 require (
 	github.com/xhit/go-str2duration/v2 v2.0.0