build: update dependency firebase-tools to v15.18.0 (main)

[angular-robot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-tools	15.17.0 → 15.18.0

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Release Notes

firebase/firebase-tools (firebase-tools)

v15.18.0

Compare Source

• Updated Pub/Sub emulator to version 0.8.31
• Resolves undefined regions earlier, during the build to backend resolution phase (#​10471)
• Updated the Firebase Data Connect local toolkit to v3.4.8, which includes the following changes:
  • Fixed an issue in Dart code generation where nullable BigInt was not handled correctly.
  • Added support for nested 1:Many relational batch inserts.
  • Updated the Golang dependency version to 1.25.10.
• Default timeout for Dart functions is now 60 seconds when not explicitly set (#​10501)
• Support secret environment variables for Cloud Run functions (#​10489)
• Set requiredProjectBindings in AI Logic services (#​10503)