Update springdoc plugin to 1.9.0 & Improve SwaggerHub Configuration and Gradle Setup (#3175)

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# Description of Changes

Please provide a summary of the changes, including:

- Refactored `SWAGGERHUB_USER` to use an environment variable instead of
a hardcoded value, increasing flexibility.
- Updated `.gitignore` to exclude `SwaggerDoc.json`, `node_modules/`,
and `.mjs` files.
- Upgraded `org.springdoc.openapi-gradle-plugin` from `1.8.0` to `1.9.0`
for better compatibility.
- Adjusted `openApi` configuration to increase `waitTimeInSeconds` to
`60` for improved Swagger doc generation stability.
- Ensured `swaggerhubUpload` task dynamically references
`SWAGGERHUB_USER` from environment variables.
- Improved `generateOpenApiDocs` task to disable state tracking,
avoiding unnecessary rebuilds.

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## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

.github/workflows/swagger.yml

@@ -35,6 +35,7 @@ jobs:
         run: ./gradlew swaggerhubUpload
         env:
           SWAGGERHUB_API_KEY: ${{ secrets.SWAGGERHUB_API_KEY }}
+          SWAGGERHUB_USER: "Frooodle"
 
       - name: Get version number
         id: versionNumber
@@ -42,6 +43,7 @@ jobs:
 
       - name: Set API version as published and default on SwaggerHub
         run: |
-          curl -X PUT -H "Authorization: ${SWAGGERHUB_API_KEY}" "https://api.swaggerhub.com/apis/Frooodle/Stirling-PDF/${{ steps.versionNumber.outputs.versionNumber }}/settings/lifecycle" -H  "accept: application/json" -H  "Content-Type: application/json" -d "{\"published\":true,\"default\":true}"
+          curl -X PUT -H "Authorization: ${SWAGGERHUB_API_KEY}" "https://api.swaggerhub.com/apis/${SWAGGERHUB_USER}/Stirling-PDF/${{ steps.versionNumber.outputs.versionNumber }}/settings/lifecycle" -H  "accept: application/json" -H  "Content-Type: application/json" -d "{\"published\":true,\"default\":true}"
         env:
           SWAGGERHUB_API_KEY: ${{ secrets.SWAGGERHUB_API_KEY }}
+          SWAGGERHUB_USER: "Frooodle"