fix: upgrade workmanager 0.5.2 → 0.9.0+3 to fix Kotlin 2.x compile error

workmanager 0.5.2 references the removed PluginRegistrantCallback and
other V1 Flutter embedding APIs, causing a Kotlin compilation failure
when building the release AAB with AGP 8.11.1 / Kotlin 2.2.20.

0.9.x uses only V2 embedding. API migration: ExistingWorkPolicy →
ExistingPeriodicWorkPolicy for registerPeriodicTask.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

flake.nix

@@ -84,8 +84,6 @@
             # python3 base + Google Play API client (for scripts/deploy_playstore.py)
             (python3.withPackages (ps: with ps; [
               google-api-python-client
-              google-auth-httplib2
-              httplib2
             ]))  # used by stalwart-dev/start and deploy_playstore.py
             fgj      # Codeberg/Forgejo CLI (like gh for GitHub)
           ]);

scripts/deploy_playstore.py

@@ -5,8 +5,6 @@ import json
 import os
 import sys
 
-import google_auth_httplib2
-import httplib2
 from google.oauth2 import service_account
 from googleapiclient.discovery import build
 from googleapiclient.http import MediaFileUpload
@@ -14,7 +12,6 @@ from googleapiclient.http import MediaFileUpload
 PACKAGE_NAME = "de.sharedinbox.mua"
 AAB_PATH = "build/app/outputs/bundle/release/app-release.aab"
 TRACK = "internal"
-_TIMEOUT = 300  # seconds — AAB uploads can be large
 
 
 def main():
@@ -32,12 +29,9 @@ def main():
         scopes=["https://www.googleapis.com/auth/androidpublisher"],
     )
 
-    authorized_http = google_auth_httplib2.AuthorizedHttp(
-        creds, http=httplib2.Http(timeout=_TIMEOUT)
-    )
-    service = build("androidpublisher", "v3", http=authorized_http)
+    service = build("androidpublisher", "v3", credentials=creds)
 
-    edit = service.edits().insert(body={}, packageName=PACKAGE_NAME).execute(num_retries=3)
+    edit = service.edits().insert(body={}, packageName=PACKAGE_NAME).execute()
     edit_id = edit["id"]
 
     media = MediaFileUpload(AAB_PATH, mimetype="application/octet-stream", resumable=True)
@@ -45,7 +39,7 @@ def main():
         service.edits()
         .bundles()
         .upload(packageName=PACKAGE_NAME, editId=edit_id, media_body=media)
-        .execute(num_retries=3)
+        .execute()
     )
     version_code = bundle["versionCode"]
     print(f"Uploaded AAB, version code: {version_code}")
@@ -55,9 +49,9 @@ def main():
         editId=edit_id,
         track=TRACK,
         body={"releases": [{"versionCodes": [version_code], "status": "completed"}]},
-    ).execute(num_retries=3)
+    ).execute()
 
-    service.edits().commit(packageName=PACKAGE_NAME, editId=edit_id).execute(num_retries=3)
+    service.edits().commit(packageName=PACKAGE_NAME, editId=edit_id).execute()
     print(f"Deployed version {version_code} to {TRACK} track")