update: go versions and setup-go GHA version

Signed-off-by: Milos Gajdos <milosthegajdos@gmail.com>

.github/workflows/ci.yaml

@@ -16,13 +16,13 @@ jobs:
       matrix:
         os: [ ubuntu-latest ]
         go:
-          - '1.20'
           - '1.21'
+          - '1.22'
 
     steps:
 
     - name: Set up Go ${{ matrix.go }}
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go }}
 
@@ -68,20 +68,20 @@ jobs:
       matrix:
         os: [ ubuntu-latest ]
         go:
-          - '1.20'
           - '1.21'
+          - '1.22'
 
     steps:
 
     - name: Check out source code
       uses: actions/checkout@v4
 
     - name: Set up Go ${{ matrix.go }}
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go }}
 
     - name: Run linter
       uses: golangci/golangci-lint-action@v3
       with:
-        version: v1.55
+        version: v1.56