Prepare release 1.5.0

Prepare release 1.5.0-rc.1

Release automation: correctly checkout release branch

Release automation

Assets version for 1.3.0

Fix CDN URL for stable releases (GoogleForCreators#5726)

If running e.g. 1.2.1 stable, the CDN URL should use that version, not `main`.

`main` should only be used for dev releases that contain a commit hash in the version number.

Bump version to 1.2. (GoogleForCreators#5642)

Merge pull request GoogleForCreators#5238 from google/fix/bump-versio…

…n-1.1.1

Bump version to 1.1.1 and update readme.txt

Merge pull request GoogleForCreators#5045 from google/revert-4900-bug…

…/1899-reset-font-weight

Revert "Text Style: Reset font weight to regular on font family change"

Bump version to 1.0.0 (GoogleForCreators#4618)