Merge pull request mackerelio#791 from mackerelio/bump-go

bump go version on build

Author: yseto

.github/workflows/test.yml

@@ -53,7 +53,7 @@ jobs:
             ${{ runner.os }}-go-
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.19.x
+          go-version: 1.20.x
       - uses: actions/checkout@v3
       - run: make clean build rpm deb
       - uses: actions/upload-artifact@v3