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 (release: 7.68.2 #27393)
• Fixed OTA environment variable configuration to use new build flag (chore: new environment variable to builds with gh actions #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

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