Bump version numbers for 1.0.6 release.

mailbox-android/build.gradle

@@ -24,8 +24,8 @@ android {
         applicationId "org.briarproject.mailbox"
         minSdkVersion 16
         targetSdkVersion 33
-        versionCode 10005
-        versionName "1.0.5"
+        versionCode 10006
+        versionName "1.0.6"
         multiDexEnabled true // only needed when minSdkVersion < 21
         vectorDrawables.useSupportLibrary = true