Use Go 1.20 and Go 1.21 in CI

Author: neilalexander

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v3
         with:
-          go-version: 1.19
+          go-version: 1.21
       - uses: actions/checkout@v3
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3
@@ -51,7 +51,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        goversion: ["1.19", "1.20"]
+        goversion: ["1.20", "1.21"]
 
     name: Build & Test (Linux, Go ${{ matrix.goversion }})
     needs: [lint]
@@ -75,7 +75,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        goversion: ["1.19", "1.20"]
+        goversion: ["1.20", "1.21"]
 
     name: Build & Test (Windows, Go ${{ matrix.goversion }})
     needs: [lint]
@@ -99,7 +99,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        goversion: ["1.19", "1.20"]
+        goversion: ["1.20", "1.21"]
 
     name: Build & Test (macOS, Go ${{ matrix.goversion }})
     needs: [lint]