Update Go & deps. version (#102)

.github/workflows/go.yml

@@ -13,10 +13,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
-      - name: Set up Go 1.19
+      - name: Set up Go 1.20
         uses: actions/setup-go@v4
         with:
-          go-version: 1.19
+          go-version: "1.20"
 
       - name: Lint
         uses: golangci/golangci-lint-action@v3
@@ -34,10 +34,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
-      - name: Set up Go 1.19
+      - name: Set up Go 1.20
         uses: actions/setup-go@v4
         with:
-          go-version: 1.19
+          go-version: "1.20"
 
       - name: Check
         run: make go_mod check_changes
@@ -47,7 +47,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest", "macOS-latest", "windows-latest"]
-        go: ["1.19", "1.20"]
+        go: ["1.20", "1.21"]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout