chore(deps): bump actions/github-script from 7 to 8

Bumps [actions/github-script](https://github.com/actions/github-script) from 7 to 8.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](https://github.com/actions/github-script/compare/v7...v8)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/bash-frozen.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - name: Comment on PR if author is not ahmetb
         if: github.event.pull_request.user.login != 'ahmetb'
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             const body = [

cmd/kubens/fzf.go

@@ -46,6 +46,14 @@ func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
 		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 
+	ctxNames, err := kc.ContextNames()
+	if err != nil {
+		return fmt.Errorf("failed to get context names: %w", err)
+	}
+	if len(ctxNames) == 0 {
+		return errors.New("no contexts found in the kubeconfig file")
+	}
+
 	cmd := exec.Command("fzf", "--ansi", "--no-preview")
 	var out bytes.Buffer
 	cmd.Stdin = os.Stdin