increment version number to 0.23.1

NEWS

+ver 0.23.1 (not yet released)
+
 ver 0.23 (2021/10/14)
 * protocol
   - new command "getvol"

android/AndroidManifest.xml

@@ -2,8 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="org.musicpd"
           android:installLocation="auto"
-          android:versionCode="60"
-          android:versionName="0.23">
+          android:versionCode="61"
+          android:versionName="0.23.1">
 
   <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="29"/>
 

doc/conf.py

@@ -38,9 +38,9 @@ author = 'Max Kellermann'
 # built documents.
 #
 # The short X.Y version.
-version = '0.23'
+version = '0.23.1'
 # The full version, including alpha/beta/rc tags.
-release = version + '~git'
+#release = version + '~git'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

meson.build

 project(
   'mpd',
   ['c', 'cpp'],
-  version: '0.23',
+  version: '0.23.1',
   meson_version: '>= 0.56.0',
   default_options: [
     'c_std=c11',