disable Go 1.16 on CI, fix cross compile workflow

.github/workflows/cross-compile.yml

@@ -4,7 +4,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [ "1.14.x", "1.15.x", "1.16.0-beta1" ]
+        go: [ "1.14.x", "1.15.x" ]
     runs-on: ubuntu-latest
     name: "Cross Compilation (Go ${{matrix.go}})"
     steps:
@@ -14,7 +14,9 @@ jobs:
           stable: '!contains(${{ matrix.go }}, "beta") && !contains(${{ matrix.go }}, "rc")'
           go-version: ${{ matrix.go }}
       - name: Install build utils
-        run: sudo apt-get install -y gcc-multilib
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-multilib
       - name: Install dependencies
         run: go build example/main.go
       - name: Run cross compilation