update to go1.20

.github/workflows/nightly.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Setup Go environment
         uses: actions/setup-go@master
         with:
-          go-version: 1.19
+          go-version: '1.20'
       - name: Cache downloaded module
         uses: actions/cache@master
         with:

.github/workflows/pull.yml

@@ -8,7 +8,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@master
         with:
-          go-version: 1.19
+          go-version: '1.20'
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@master

.github/workflows/push.yml

@@ -8,7 +8,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@master
         with:
-          go-version: 1.19
+          go-version: '1.20'
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@master

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@master
         with:
-          go-version: '1.19'
+          go-version: '1.20'
 
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@master