[Release] Updating to v1.6.66

[rane-rajasi]

This release contains:

• Fix: Include FIPS-updates repo in security source list 348
• Fix: Failing UT 347
• Feature: [Ubuntu, non-CVM] Updating UEFI and kek certificates during default patching 346
• Feature: Adding Azure Linux 4.0 Base Support using dnf5 package manager 343

[Copilot]

Pull request overview

This PR performs a release-version bump to v1.6.66 across the extension manifest and the two in-code version constants, aligning the packaged extension metadata with the runtime-reported version.

Changes:

• Updated manifest.xml extension <Version> to 1.6.66.
• Updated EXT_VERSION to 1.6.66 in both extension and core bootstrap constants.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/extension/src/manifest.xml	Bumps the extension manifest version to 1.6.66.
src/extension/src/Constants.py	Updates the extension-side EXT_VERSION constant to 1.6.66.
src/core/src/bootstrap/Constants.py	Updates the core bootstrap EXT_VERSION constant to 1.6.66.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.01%. Comparing base (2e8d623) to head (7a5c152).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #353   +/-   ##
=======================================
  Coverage   94.01%   94.01%           
=======================================
  Files         107      107           
  Lines       19686    19686           
=======================================
  Hits        18508    18508           
  Misses       1178     1178           

Flag	Coverage Δ
python27	94.01% <100.00%> (ø)
python312	94.01% <100.00%> (ø)

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