ci: update mod to 1.20 and release action

Author: benjivesterby

.github/workflows/release.yml

@@ -10,7 +10,6 @@ jobs:
     name: "Build & Unit Tests"
     strategy:
       matrix:
-        go-version: [1.18.x, 1.19.x, 1.20.x]
         platform: [ubuntu-latest, macos-latest, windows-latest]
       fail-fast: true
     runs-on: ${{ matrix.platform }}
@@ -20,8 +19,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v4
         with:
-          go-version: ${{ matrix.go-version }}
-          stable: false
+          go-version: ${{ vars.GO_VERSION }}
       - name: Build
         run: go build ./...
       - name: Test

go.mod

@@ -1,6 +1,6 @@
 module go.devnw.com/ajson
 
-go 1.18
+go 1.20
 
 require (
 	github.com/davecgh/go-spew v1.1.1