chore(deps): update dependency firebase-tools to ^13.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-tools	^13.20.2 -> ^13.21.0

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Release Notes

firebase/firebase-tools (firebase-tools)

v13.21.0

Compare Source

• Add apphosting:rollouts:create CLI command. (#​7687)
• Updated emulator UI to version 1.14.0, which adds support for SDK defined extensions.
• Added emulator support for SDK defined extensions.
• Fixed various trigger handling issues in the Functions emualtor, including an issue where Eventarc functions would not be emulated correctly after a reload.
• Added support for generating Dart SDKs for Data Connect connectors.
• Commands now correctly default to 'default' alias when there is more than one alias listed. (#​7624)
• Updated Data Connect emulator to v1.15.0, which includes bug fixes for insertMany and improved error handling.

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