chore(ci): pnpm11 approve-builds (#397)

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### Description
enable during CI runs: `pnpm approve-builds`

Resolves or fixes issue: <!-- ✍️ Add GitHub issue number in format
`#0000` - if there is none fitting, create one -->

### AI Tool Disclosure

- [x] My contribution does not include any AI-generated content
- [ ] My contribution includes AI-generated content, as disclosed below:
  - AI Tools: `[e.g. GitHub CoPilot, ChatGPT, JetBrains Junie etc.]`
- LLMs and versions: `[e.g. GPT-4.1, Claude Haiku 4.5, Gemini 2.5 Pro
etc.]`
- Prompts: `[Summarize the key prompts or instructions given to the AI
tools]`

### Affirmation

- [x] My code follows the
[CONTRIBUTING.md](https://github.com/CycloneDX/cyclonedx-node-module/blob/master/CONTRIBUTING.md)
guidelines

---------

Signed-off-by: Jan Kowalleck <jan.kowalleck@gmail.com>

Author: jkowalleck

.github/workflows/nodejs.yml

@@ -124,10 +124,14 @@ jobs:
           - "25"      # Current
           - "24"      # Active LTS
           - "22"
-          - "20"
-          - "18"
         pnpm-version: [ "latest" ]
         include:
+          - os: "ubuntu-latest"
+            node-version: "20"
+            pnpm-version: "latest-10" # see https://github.com/pnpm/pnpm/issues/11546#issuecomment-4407057536
+          - os: "ubuntu-latest"
+            node-version: "18"
+            pnpm-version: "latest-9"  # see https://github.com/pnpm/pnpm/issues/11546#issuecomment-4407057536
           - os: "ubuntu-latest"
             node-version: "16"
             pnpm-version: "latest-8"  # see https://www.npmjs.com/package/pnpm/?activeTab=versions

pnpm-workspace.yaml

@@ -0,0 +1,8 @@
+packages:
+  - .
+
+# see https://pnpm.io/settings#allowbuilds
+onlyBuiltDependencies:  # pnpm10
+  - electron
+allowBuilds:  # pnpm11+
+  libxmljs2: true