Release v2.21.0

Author: demeyerthom

.changes/unreleased/Added-20240223-163007.yaml

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+## v2.21.0 - 2024-10-08
+### Added
+* Added `github` and `json` logging options to change output 
+* Added option to set global and site-level configurations. These will be merged into the component variables during generation
+* Added command to validate terraform configurations
+* Added git-fallback option to cloud update command. Usage; `mach-composer update --cloud --git-fallback`
+### Fixed
+* Continue with update proces even when commits / changelogs cannot be fetched between old and new version
+* Updated to latest SDK version
+* Added a ticker when running go routines to show activity
+### Dependency
+* chore(deps): bump the github-actions group with 2 updates
+* chore(deps): bump the go group with 2 updates