chore: Bump version to 2.14.3 (#7554)

# Description of Changes

This PR bumps the Stirling PDF application version from `2.14.2` to
`2.14.3` across the project.

Changes include:

- Updated the Gradle project version in `build.gradle` to `2.14.3`.
- Updated the Tauri desktop application version in
`frontend/editor/src-tauri/tauri.conf.json`.
- Updated the AUR package version for `stirling-pdf-desktop`.
- Updated the AUR package version for `stirling-pdf-server-bin`.
- Updated the mocked `appVersion` used by the core frontend server
experience simulations.
- Updated the mocked `appVersion` used by the proprietary frontend
server experience simulations.
- Kept all application, desktop, packaging, and test/simulation version
references synchronized for the `2.14.3` release.

The change prepares the project metadata and packaging configuration for
the `2.14.3` release and prevents different components from reporting or
packaging the previous `2.14.2` version.


---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] 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/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] 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/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### 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 run `task check` to verify linters, typechecks, and tests
pass
- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#7-testing)
for more details.

.github/aur/stirling-pdf-desktop/PKGBUILD

@@ -1,6 +1,6 @@
 # Maintainer: Stirling PDF Inc <contact@stirlingpdf.com>
 pkgname=stirling-pdf-desktop
-pkgver=2.14.2
+pkgver=2.14.3
 pkgrel=1
 pkgdesc="Locally hosted, web-based PDF manipulation tool (Tauri desktop app, official Stirling PDF Inc build)"
 arch=('x86_64')

.github/aur/stirling-pdf-server-bin/PKGBUILD

@@ -1,6 +1,6 @@
 # Maintainer: Stirling PDF Inc <contact@stirlingpdf.com>
 pkgname=stirling-pdf-server-bin
-pkgver=2.14.2
+pkgver=2.14.3
 pkgrel=1
 pkgdesc="Locally hosted, web-based PDF manipulation tool (server JAR, prebuilt)"
 arch=('any')