chore: update to 2.1.0

[github-actions]

Release 2.1.0

This PR prepares the release for version 2.1.0.

Manual Steps Required

• Merge this PR (squash and merge)
• Create a new release on GitHub with the tag 2.1.0.
• Ask any LLM to categorize the changelog into sections.
• Place the changelog in the release note.
• Download the dist.tar.gz artifact from the workflow run and upload it to the release.
• (Beta only) Set prerelease
• Publish the release note on GitHub.

Changelog

- #6877 chore: npm update 
- #6875 chore: Update final release workflow 
- #6853 chore: Translations Update from Weblate (Thanks @2000Arion @Aluisio @AnnAngela @cyril59310 @dodog @jochemp264 @Kf637 @michi-onl @MrEddX)
- #6849 feat: Adding monitor_id and heartbeat_id to HaloPSA (Thanks @Yasindu20)
- #6845 fix: certificate expiry (use Settings.set instead of Settings.setSetting) (Thanks @epifeny)
- #6843 feat(discord): add custom message and format presets for notifications (Thanks @epifeny)
- #6841 fix: weblate conflict (Thanks @Aluisio @AnnAngela @cyril59310 @dodog @FunNikita @Kf637 @kurama @mafen @michi-onl @MrEddX @pmontp19)
- #6835 feat(slack): Add option to include monitor group name in notifications (Thanks @dovansy1998)
- #6834 feat(i18n): Add Bavarian German language support 
- #6830 feat(notification): add Jira Service Management as a notification provider (Thanks @jankal)
- #6822 fix: improve monitor list selection behavior (Thanks @frozenflux2)
- #6817 Translations Update from Weblate (Thanks @Aluisio @AnnAngela @dodog @FunNikita @Kf637 @kurama @mafen @michi-onl @MrEddX @pmontp19)
- #6814 chore: Revert "feat: added monitoring for postgres query result" 
- #6805 fix: RSS pubDate timezone issue with backend test (#6422) (Thanks @Aqudi)
- #6804 feat(ntfy): add custom title and message templates for notifications (Thanks @epifeny)
- #6795 fix: monitor names hidden by tags (Thanks @bittoby)
- #6792 fix: expand/collapse all groups now works with nested groups (Thanks @kurama)
- #6791 Fix bot filtering in generate-changelog.mjs 
- #6789 fix: Add input validation for monitor ID in badge endpoints (Thanks @Angel98518)
- #6787 chore: update to 2.1.0-beta.3 
- #6783 fix: improve RADIUS client error handling and socket cleanup (Thanks @dive2tech)
- #6778 fix: MongoDB monitor JSON.parse error handling (Thanks @Angel98518)
- #6777 feat: add google sheets notification provider (Thanks @dharunashokkumar)
- #6597 chore: Translations Update from Weblate (Thanks @101br03k @2000Arion @aindriu80 @Aluisio @AndyLCQ @AnnAngela @atriwidada @bkzspam @Buchtic @cyril59310 @dodog @Donglingfeng @hackerpro17s @IsayIsee @isfan14 @ivanbratovic @JavierLuna @JWeinelt @Kodashas @michi-onl @MrEddX @simonghpub @superpep @tony-chompoo @Virenbar)
- #6163 feat: add Globalping support (Thanks @radulucut)



LLM Task: Please help to put above PRs into the following sections based on their content. If a PR fits multiple sections, choose the most relevant one. If a PR doesn't fit any section, place it in "Others". If there are grammatical errors in the PR titles, please correct them. Don't change the PR numbers and authors, and keep the format. Output as markdown file format.

Changelog:

### 🆕 New Features

### 💇‍♀️ Improvements

### 🐞 Bug Fixes

### ⬆️ Security Fixes

### 🦎 Translation Contributions

### Others
- Other small changes, code refactoring and comment/doc updates in this repo:

Release Artifacts

The dist.tar.gz archive will be available as an artifact in the workflow run.

[Copilot]

Pull request overview

Prepares the Uptime Kuma 2.1.0 final release by updating the project version metadata and aligning the npm run setup script to check out the 2.1.0 tag.

Changes:

• Bump version from 2.1.0-beta.3 to 2.1.0 in package.json.
• Bump version from 2.1.0-beta.3 to 2.1.0 in package-lock.json.
• Update the setup script to git checkout 2.1.0.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
package.json	Updates release version and adjusts setup to check out the 2.1.0 tag.
package-lock.json	Keeps lockfile metadata in sync with the new 2.1.0 version.