Upgrade to 1.20 instead

.github/workflows/golangci-lint.yml

@@ -16,10 +16,10 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.17
+      - name: Set up Go 1.20
         uses: actions/setup-go@v4
         with:
-          go-version: '1.17'
+          go-version: '1.20'
       - uses: actions/checkout@v2
       - name: golangci-lint
         uses: golangci/[email protected]

.github/workflows/workflow.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.17.x', '1.18.x', '1.19.x' ]
+        go: [ '1.20.x' ]
     name: Vulcanizer tests against go version ${{ matrix.go }}
     steps:
     - uses: actions/checkout@v2

go.mod

@@ -1,6 +1,6 @@
 module github.com/github/vulcanizer
 
-go 1.17
+go 1.20
 
 require (
 	github.com/elazarl/goproxy v0.0.0-20191011121108-aa519ddbe484 // indirect