chore: release v0.15.3 (#2265)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Prepares the stable `v0.15.3` release.
> 
> - Update `CHANGELOG.md`: replace `Unreleased` with `0.15.3` and
document fix for false errors during Terragrunt module loading
> - Bump `VERSION` from `0.15.3-rc1` to `0.15.3`
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
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<!-- /CURSOR_SUMMARY -->

Author: snakster

CHANGELOG.md

@@ -20,7 +20,7 @@ Given a version number `MAJOR.MINOR.PATCH`, we increment the:
 - Backward compatibility in versions `0.0.z` is **not guaranteed** when `z` is increased.
 - Backward compatibility in versions `0.y.z` is **not guaranteed** when `y` is increased.
 
-## Unreleased
+## 0.15.3
 
 ### Fixed
 

VERSION

@@ -1 +1 @@
-0.15.3-rc1
+0.15.3