Fix installation of Go dependencies in GitHub Actions.

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

Author: PiotrSikora

.github/workflows/rust.yml

@@ -36,8 +36,11 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Check licenses
+      uses: actions/setup-go@v2
+      with:
+        go-version: '^1.16'
       run: |
-        go get -u github.com/google/addlicense
+        go install github.com/google/addlicense@latest
         export PATH=$PATH:$(go env GOPATH)/bin
         addlicense -check .
 
@@ -66,8 +69,11 @@ jobs:
       run: bazelisk --noworkspace_rc build --platforms=@rules_rust//rust/platform:wasi //...
 
     - name: Format (buildifier)
+      uses: actions/setup-go@v2
+      with:
+        go-version: '^1.16'
       run: |
-        GO111MODULE=on go get -u github.com/bazelbuild/buildtools/buildifier@3.4.0
+        go get install github.com/bazelbuild/buildtools/buildifier@latest
         export PATH=$PATH:$(go env GOPATH)/bin
         buildifier -mode=check WORKSPACE
         buildifier -mode=check BUILD