Update OpenVPN for Android to 0.7.21 (175)

metadata/de.blinkt.openvpn.yml

@@ -454,11 +454,26 @@ Builds:
         =\ false/' build.gradle.kts
     ndk: r19c
 
+  - versionName: 0.7.21
+    versionCode: 175
+    commit: v0.7.21
+    subdir: main
+    submodules: true
+    gradle:
+      - ui
+    rm:
+      - main/src/main/cpp/mbedtls/programs/fuzz
+      - main/src/main/cpp/mbedtls/tests
+      - main/src/main/cpp/openvpn3/test/unittests
+    prebuild: sed -i -e '/signingConfigs.getByName/d' -e 's/isEnable\ =\ true/isEnable\
+        =\ false/' build.gradle.kts
+    ndk: r19c
+
 MaintainerNotes: |-
     Build instructions:
     https://github.com/schwabe/ics-openvpn/blob/master/.travis.yml
 
 AutoUpdateMode: Version v%v
 UpdateCheckMode: Tags
-CurrentVersion: 0.7.20
-CurrentVersionCode: 174
+CurrentVersion: 0.7.21
+CurrentVersionCode: 175