feat: update native Firebase SDK versions (invertase#3663)

Updated Firebase Android SDK BoM version to 25.3.1 (from 24.1.0) and iOS SDK to 6.25.0 (from 6.13.0).

[publish]

Author: russellwheatley

RNFBFirestore.podspec

@@ -7,7 +7,7 @@ coreVersionRequired = package['peerDependencies'][appPackage['name']]
 if appPackage['sdkVersions']
   firebase_sdk_version = appPackage['sdkVersions']['ios']['firebase']
 else
-  firebase_sdk_version = '~> 6.13.0'
+  firebase_sdk_version = '~> 6.25.0'
 end
 if coreVersionDetected != coreVersionRequired
   Pod::UI.warn "NPM package '#{package['name']}' depends on '#{appPackage['name']}' v#{coreVersionRequired} but found v#{coreVersionDetected}, this might cause build issues or runtime crashes."

android/build.gradle

@@ -30,7 +30,7 @@ if (findProject(':@react-native-firebase_app')) {
 }
 def packageJson = PackageJson.getForProject(project)
 def appPackageJson = PackageJson.getForProject(appProject)
-def firebaseBomVersion = appPackageJson['sdkVersions'] ? appPackageJson['sdkVersions']['android']['firebase'] : "24.1.0"
+def firebaseBomVersion = appPackageJson['sdkVersions'] ? appPackageJson['sdkVersions']['android']['firebase'] : "25.3.1"
 def coreVersionDetected = appPackageJson['version']
 def coreVersionRequired = packageJson['peerDependencies'][appPackageJson['name']]
 // Only log after build completed so log warning appears at the end