build(deps-dev): bump @microsoft/api-extractor from 7.15.2 to 7.18.4 (#1379)

* build(deps-dev): bump @microsoft/api-extractor from 7.15.2 to 7.18.4

Bumps [@microsoft/api-extractor](https://github.com/microsoft/rushstack) from 7.15.2 to 7.18.4.
- [Release notes](https://github.com/microsoft/rushstack/releases)
- [Commits](https://github.com/microsoft/rushstack/compare/@microsoft/api-extractor_v7.15.2...@microsoft/api-extractor_v7.18.4)

---
updated-dependencies:
- dependency-name: "@microsoft/api-extractor"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

* fix: Updated API report with the new API Extractor version

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Hiranya Jayathilaka <[email protected]>

Author: dependabot[bot]

etc/firebase-admin.api.md

@@ -4,6 +4,8 @@
 
 ```ts
 
+/// <reference types="node" />
+
 import { Agent } from 'http';
 import { Bucket } from '@google-cloud/storage';
 import * as _firestore from '@google-cloud/firestore';
@@ -923,7 +925,7 @@ export namespace messaging {
         title?: string;
         vibrate?: number | number[];
     }
-    {};
+        {};
 }
 
 // @public
@@ -1138,7 +1140,6 @@ export namespace storage {
     }
 }
 
-
 // (No @packageDocumentation comment for this package)
 
 ```