Update Golang to v1.20 for main branch.

Signed-off-by: Xun Jiang <blackpiglet@gmail.com>

.github/workflows/crds-verify-kind.yaml

@@ -12,9 +12,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: 1.19
+          go-version: '1.20'
         id: go
       # Look for a CLI that's made for this PR
       - name: Fetch built CLI

.github/workflows/e2e-test-kind.yaml

@@ -12,9 +12,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: 1.19
+          go-version: '1.20'
         id: go
       # Look for a CLI that's made for this PR
       - name: Fetch built CLI
@@ -70,9 +70,9 @@ jobs:
       fail-fast: false
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: 1.19
+          go-version: '1.20'
         id: go
       - name: Check out the code
         uses: actions/checkout@v2

.github/workflows/pr-ci-check.yml

@@ -8,9 +8,9 @@ jobs:
       fail-fast: false
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: 1.19
+          go-version: '1.20'
         id: go
       - name: Check out the code
         uses: actions/checkout@v2

.github/workflows/push.yml

@@ -16,9 +16,9 @@ jobs:
     steps:
 
     - name: Set up Go
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v4
       with:
-        go-version: 1.19
+        go-version: '1.20'
       id: go
 
     - uses: actions/checkout@v3