[firestore]: bump @gqlify/server peer dep

[jthegedus]

Allow using gqlify/server v3 with gqlify/firestore.

Currently we get a warning on installation:

warning " > @gqlify/[email protected]" has incorrect peer dependency "@gqlify/[email protected]".
warning " > @gqlify/[email protected]" has incorrect peer dependency "firebase-admin@^6.3.0".

Additionally, the firebase-admin peer dep throws the above warning even when using "firebase-admin": "^8.1.0", no idea what the fix is here