Fix compass_app build issues (#2729)

[resnickj]

Fix build issues that prevent compass_app from building and running out of the box.

• add compass_app folders to list of workspaces in root pubspec
• align dependency versions to resolve conflicts

Pre-launch Checklist

• I read the Flutter Style Guide recently, and have followed its advice.
• [ x] I signed the CLA.
• [ x] I read the Contributors Guide.
• I have added sample code updates to the changelog.
• I updated/added relevant documentation (doc comments with ///).

If you need help, consider asking for advice on the #hackers-devrel channel on Discord.

[guidezpl]

Can you also update

-    id "com.android.application" version "8.1.0" apply false
+    id "com.android.application" version "8.1.1" apply false

per #2729 (comment)?

[resnickj]

Can you also update

-    id "com.android.application" version "8.1.0" apply false
+    id "com.android.application" version "8.1.1" apply false

per #2729 (comment)?

I pushed a second commit, but updated to 8.6.0 instead of 8.1.1, and updated a few other versions that I think needed updating? (this was a few weeks ago so I can't quite remember if these changes were required or just suggested...)