Bump actions use go 1.16 (#4792)

* use go 1.16
* use ^ to allow latest minor/patch version available

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

.github/workflows/go.coverage.yml

@@ -8,6 +8,8 @@ jobs:
 
     - name: Install Go
       uses: actions/setup-go@v2
+      with:
+        go-version: '^1.16'
       id: go
 
     - name: Check out code

.github/workflows/go.test.yml

@@ -8,6 +8,8 @@ jobs:
 
     - name: Install Go
       uses: actions/setup-go@v2
+      with:
+        go-version: '^1.16'
       id: go
 
     - name: Check out code
@@ -29,6 +31,8 @@ jobs:
 
     - name: Install Go
       uses: actions/setup-go@v2
+      with:
+        go-version: '^1.16'
       id: go
 
     - name: Check out code
@@ -47,6 +51,8 @@ jobs:
 
     - name: Install Go
       uses: actions/setup-go@v2
+      with:
+        go-version: '^1.16'
       id: go
 
     - name: Check out code

.github/workflows/make.doc.yml

@@ -14,6 +14,8 @@ jobs:
       -
         name: Setup Go
         uses: actions/setup-go@v2
+        with:
+          go-version: '^1.16'
       -
         name: Update Docs
         run: |