ci: fix stale cliff.toml remote owner (awslabs -> aws) (#747)

git-cliff's GitHub API enrichment was pointed at the wrong owner
(awslabs/aws-lambda-web-adapter), which 404s. Correct it to
aws/aws-lambda-web-adapter so PR/author links resolve.

Scope note: this PR originally also reworked the Changelog workflow to
open a PR instead of pushing to protected main, but per maintainer
feedback the release pipeline will be refactored with release-plz
instead, so this PR is narrowed to the one obvious cliff.toml fix.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: JamBalaya56562

cliff.toml

@@ -67,5 +67,5 @@ tag_pattern = "v[0-9].*"
 sort_commits = "newest"
 
 [remote.github]
-owner = "awslabs"
+owner = "aws"
 repo = "aws-lambda-web-adapter"