Update AnkiDroid to 2.9.1 (20901300)

metadata/com.ichi2.anki.yml

@@ -398,9 +398,21 @@ Builds:
     scanignore:
       - AnkiDroid/src/main/java/com/ichi2/libanki/hooks/ExternalHookLoader.java
 
+  - versionName: 2.9.1
+    versionCode: 20901300
+    commit: v2.9.1
+    subdir: AnkiDroid
+    gradle:
+      - yes
+    rm:
+      - tools
+      - docs
+    scanignore:
+      - AnkiDroid/src/main/java/com/ichi2/libanki/hooks/ExternalHookLoader.java
+
 MaintainerNotes: Uses DexLoader to load custom decks and plugins (?).
 
 AutoUpdateMode: Version v%v
 UpdateCheckMode: Tags ^v[0-9.]*$
-CurrentVersion: '2.9'
-CurrentVersionCode: 20900300
+CurrentVersion: 2.9.1
+CurrentVersionCode: 20901300