Avoid intermittent CI failures while setting up Go

Switch to `actions/setup-go@v2-beta` which advertises better retries
around downloading the Go version

.github/workflows/go.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: Set up Go 1.13
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v2-beta
         with:
           go-version: 1.13
 

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Set up Go 1.13
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v2-beta
         with:
           go-version: 1.13
 

.github/workflows/releases.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Set up Go 1.13
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v2-beta
         with:
           go-version: 1.13
       - name: Generate changelog