chore(workflows): update setup-go

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
         os: [macos-latest, windows-latest, ubuntu-latest]
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-go@v1
+      - uses: actions/setup-go@v2
         with:
           go-version: 1.15
       - run: go build ./cmd/condition-gitlab/
@@ -35,10 +35,9 @@ jobs:
     needs: build
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-go@v1
+      - uses: actions/setup-go@v2
         with:
           go-version: 1.15
-      - run: echo "::add-path::~/go/bin"
       - run: |
           go get github.com/mitchellh/gox
           go get github.com/tcnksm/ghr