Update OpenKeychain to 5.3 (53004)

metadata/org.sufficientlysecure.keychain.yml

@@ -676,6 +676,17 @@ Builds:
       - extern/bouncycastle/core/src/test
       - OpenKeychain/src/test/resources/OpenPGP-Haskell/tests
 
+  - versionName: '5.3'
+    versionCode: 53004
+    commit: v5.3
+    subdir: OpenKeychain
+    submodules: true
+    gradle:
+      - fdroid
+    scanignore:
+      - extern/bouncycastle/core/src/test
+      - OpenKeychain/src/test/resources/OpenPGP-Haskell/tests
+
 MaintainerNotes: |-
     Summary and Description are maintained by upstream using fastlane in
     the source repo:
@@ -683,5 +694,5 @@ MaintainerNotes: |-
 
 AutoUpdateMode: Version v%v
 UpdateCheckMode: Tags ^v[0-9.]+$
-CurrentVersion: '5.2'
-CurrentVersionCode: 52009
+CurrentVersion: '5.3'
+CurrentVersionCode: 53004