feat(go): bump relevant components to 1.21 (#987)

Signed-off-by: Oliver Bähler <oliverbaehler@hotmail.com>

.github/workflows/diff.yml

@@ -21,7 +21,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v5.0.0
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - run: make installer
       - name: Checking if YAML installer file is not aligned
         run: if [[ $(git diff | wc -l) -gt 0 ]]; then echo ">>> Untracked generated files have not been committed" && git --no-pager diff && exit 1; fi

.github/workflows/e2e.yml

@@ -45,7 +45,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v5.0.0
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - run: make manifests
       - name: Checking if manifests are disaligned
         run: test -z "$(git diff 2> /dev/null)"

.github/workflows/lint.yml

@@ -17,9 +17,12 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v5.0.0
+        with:
+          go-version: '1.21'
       - name: Run golangci-lint
         uses: golangci/golangci-lint-action@3cfe3a4abbb849e10058ce4af15d205b6da42804 # v4.0.0
         with:
-          version: v1.51.2
+          version: v1.56.2
           only-new-issues: false
           args: --timeout 5m --config .golangci.yml