Update Go version in GitHub Actions to 1.18.4

Signed-off-by: Angel Misevski <amisevsk@redhat.com>

Author: amisevsk

.github/workflows/code-coverage.yml

@@ -14,7 +14,7 @@ jobs:
       name: Set up Go 1.x
       uses: actions/setup-go@v2
       with:
-        go-version: 1.17.12
+        go-version: 1.18.4
     -
       name: Set up Python 3.8
       uses: actions/setup-python@v2

.github/workflows/pr.yml

@@ -15,7 +15,7 @@ jobs:
       name: Set up Go 1.x
       uses: actions/setup-go@v2
       with:
-        go-version: 1.17.12
+        go-version: 1.18.4
     -
       name: Set up Python 3.8
       uses: actions/setup-python@v2

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Set up Go 1.x
         uses: actions/setup-go@v2
         with:
-          go-version: 1.17.12
+          go-version: 1.18.4
 
       - name: Clone source code
         uses: actions/checkout@v2