fix(typesctipt-angular-21-provided-on-root): fix typo in pom

[sergejomon]

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Summary by cubic

Fixed a typo in the pom.xml for the TypeScript Angular v21 “provided-in-root” sample. Updated the artifactId and name from v20 to v21 to match the sample and avoid mislabeling in builds.

^{Written for commit 4dfa73f. Summary will update on new commits.}

[cubic-dev-ai]

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