Minor fixes for informational messages.

Author: uhop

.github/actions/linux-node-21/action.yml

@@ -1,5 +1,5 @@
 name: 'Create a binary artifact for Node 21 on Linux'
-description: 'Create a binary artifact for Node 21 on Linux using node:21-buster'
+description: 'Create a binary artifact for Node 21 on Linux using node:21-bullseye'
 inputs:
   node-version:
     description: 'Node.js version'

.github/workflows/build.yml

@@ -82,7 +82,7 @@ jobs:
         GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
 
   build-linux-node-21:
-    name: Node.js 21 on Debian Buster
+    name: Node.js 21 on Debian Bullseye
     needs: create-release
     runs-on: ubuntu-latest
     continue-on-error: true