chore(ci): node26 (#396)

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### Description

add Node26 to CI

Resolves or fixes issue: #394 

### 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

@@ -41,7 +41,7 @@ jobs:
         node-version:
           # action based on https://github.com/actions/node-versions/releases
           # see also: https://nodejs.org/en/about/releases/
-          - "25"      # Current
+          - "26"      # Current
           - "24"      # Active LTS
           - "22"
           - "20"
@@ -82,7 +82,7 @@ jobs:
         node-version:
           # action based on https://github.com/actions/node-versions/releases
           # see also: https://nodejs.org/en/about/releases/
-          - "25"      # Current
+          - "26"      # Current
           - "24"      # Active LTS
           - "22"
           - "20"
@@ -121,7 +121,7 @@ jobs:
         node-version:
           # action based on https://github.com/actions/node-versions/releases
           # see also: https://nodejs.org/en/about/releases/
-          - "25"      # Current
+          - "26"      # Current
           - "24"      # Active LTS
           - "22"
         pnpm-version: [ "latest" ]