CI: update golangci-lint install url, bump to 1.43

The golangci-lint install script at goreleaser.com is deprecated. Docs
now advise to install from a github link:

> golangci/golangci-lint err this script is deprecated, please do not
> use it anymore. check goreleaser/godownloader#207

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Check out source
         uses: actions/checkout@v2
       - name: Install Linters
-        run: "curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.42.1"
+        run: "curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.43.0"
 
       - name: Test
         env: