doc: Adjust current stable release info

flaix · flaix · commit 16404d1eb6d7 · 2023-04-03T22:46:43.000+02:00
That was not updated after the 1.9.3 hotfix release.
diff --git a/build.moxie b/build.moxie
@@ -14,8 +14,8 @@ version: 1.10.0-SNAPSHOT
 inceptionYear: 2011
 
 # Current stable release
-releaseVersion: 1.9.2
-releaseDate: 2022-02-05
+releaseVersion: 1.9.3
+releaseDate: 2022-04-09
 
 # Project urls
 url: 'http://gitblit.com'
