Bump com.google.firebase:firebase-bom from 32.4.0 to 32.7.3

[dependabot[bot]]

Bumps com.google.firebase:firebase-bom from 32.4.0 to 32.7.3.

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[dturner]

The new version of Firebase adds permissions which, afaict, we don't want as they are associated with advertising (which the app doesn't have). Here's the build failure due to badging differences:

* What went wrong:
Execution failed for task ':app:checkProdReleaseBadging'.
> Generated badging is different from golden badging! If this change is intended, run ./gradlew updateProdReleaseBadging
  value of:
      readText$default(...)
  diff (-expected +actual):
      @@ -6,6 +6,8 @@
       uses-permission: name='android.permission.POST_NOTIFICATIONS'
       uses-permission: name='android.permission.WAKE_LOCK'
       uses-permission: name='com.google.android.c2dm.permission.RECEIVE'
      +uses-permission: name='android.permission.ACCESS_ADSERVICES_ATTRIBUTION'
      +uses-permission: name='android.permission.ACCESS_ADSERVICES_AD_ID'
       uses-permission: name='com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE'
       uses-permission: name='android.permission.RECEIVE_BOOT_COMPLETED'
       uses-permission: name='android.permission.FOREGROUND_SERVICE'
      @@ -105,6 +107,7 @@
       application-icon-65534:'res/mipmap-anydpi-v26/ic_launcher.xml'
       application: label='Now in Android' icon='res/mipmap-anydpi-v26/ic_launcher.xml'
       launchable-activity: name='com.google.samples.apps.nowinandroid.MainActivity'  label='' icon=''
      +property: name='android.adservices.AD_SERVICES_CONFIG' resource='res/xml/ga_ad_services_config.xml' 
       uses-library-not-required:'android.ext.adservices'
       uses-library-not-required:'androidx.window.extensions'
       uses-library-not-required:'androidx.window.sidecar'

[dependabot[bot]]

A newer version of com.google.firebase:firebase-bom exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.