release: release-changelog/7.68.3 (#27513)

This PR updates the change log for 7.68.3. (Hotfix - no test plan
generated.)

## **Description**

Adds a new `7.68.3` section to `CHANGELOG.md` documenting two hotfixes:
- Fixed seedless onboarding vault decryption crash by handling both
vault formats in encryptorAdapter (#27393)
- Fixed OTA environment variable configuration to use new build flag
(#26668)

Updates the changelog reference links so `Unreleased` now compares from
`v7.68.3` and includes a new `7.68.3` compare link.

## **Changelog**

CHANGELOG entry: null

## **Related issues**

Fixes:

## **Manual testing steps**

N/A - changelog only

## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I've included tests if applicable
- [x] I've documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I've applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Changelog-only update with no runtime code changes; risk is limited to
potential version/compare-link inaccuracies in release notes.
> 
> **Overview**
> Adds a new `7.68.3` section to `CHANGELOG.md` documenting two hotfixes
(seedless onboarding vault decryption crash handling and OTA env var
build-flag update).
> 
> Updates the version reference links by introducing a new `[7.68.3]`
compare link.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
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<!-- /CURSOR_SUMMARY -->

Author: chloeYue

CHANGELOG.md

@@ -64,6 +64,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed token hiding not working on the redesigned homepage (#26649)
 - Fixed an issue that could cause repeated Bridge RPC balance calls and improved how quickly source balances appear after token selection (#25952)
 
+## [7.68.3]
+
+### Fixed
+
+- Fixed seedless onboarding vault decryption crash by handling both vault formats in encryptorAdapter (#27393)
+- Fixed OTA environment variable configuration to use new build flag (#26668)
+
 ## [7.68.2]
 
 ### Fixed
@@ -10918,6 +10925,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [#954](https://github.com/MetaMask/metamask-mobile/pull/954): Bugfix: onboarding navigation (#954)
 
 [Unreleased]: https://github.com/MetaMask/metamask-mobile/compare/v7.69.0...HEAD
+[7.68.3]: https://github.com/MetaMask/metamask-mobile/compare/v7.69.0...v7.68.3
 [7.69.0]: https://github.com/MetaMask/metamask-mobile/compare/v7.68.2...v7.69.0
 [7.68.2]: https://github.com/MetaMask/metamask-mobile/compare/v7.68.1...v7.68.2
 [7.68.1]: https://github.com/MetaMask/metamask-mobile/compare/v7.68.0...v7.68.1