Update Simple Reboot to 8.1 (1803261729)

Closes fdroid/fdroiddata#1845.

metadata/simple.reboot.com.yml

@@ -25,16 +25,6 @@ Builds:
     rm:
       - app/libs/libsuperuser/build
 
-  - versionName: '7.0'
-    versionCode: 12
-    disable: doesnt build, forcevercode seems to be broken
-    commit: e707a11490ca0f5a81675069b688765ab270648c
-    subdir: app
-    gradle:
-      - yes
-    forcevercode: true
-    prebuild: sed -i -e '/java.home/d' ../gradle.properties
-
   - versionName: '7.0'
     versionCode: 13
     commit: e707a11490ca0f5a81675069b688765ab270648c
@@ -58,11 +48,19 @@ Builds:
       - sed -i -e 's/-beta3//g' -e '/versionCode /s/getVersionCodeTimestamp()/$$VERCODE$$/g'
         build.gradle ../build.gradle
 
+  - versionName: '8.1'
+    versionCode: 1803261729
+    commit: 6c66d74e79c05598e9e61d5019dbc92ee4a749bf
+    subdir: app
+    gradle:
+      - yes
+
 MaintainerNotes: |-
-    Upstream now uses time-based version codes generated at build-time. Both would
-    break UCM on its own, so set this to static for now.
+    7.0 and 7.0.1 used time-based version codes generated at build-time.
+
+    UCM is static because releases aren't tagged.
 
 AutoUpdateMode: None
 UpdateCheckMode: Static
-CurrentVersion: 7.0.1
-CurrentVersionCode: 14
+CurrentVersion: '8.1'
+CurrentVersionCode: 1803261729