Merge pull request #4744 from nextcloud/v3100_Alpha1

bump to 3.10.0 Alpha1

build.gradle

@@ -81,7 +81,7 @@ repositories {
 
 // semantic versioning for version code
 def versionMajor = 3
-def versionMinor = 9
+def versionMinor = 10
 def versionPatch = 0
 def versionBuild = 0 // 0-50=Alpha / 51-98=RC / 90-99=stable