Update jgit version

The old version of jgit doesn't support DIRC version 4, which
can result in exceptions being thrown by the ratchetFrom
implementation in some situations (likely dependent on the user's
local git version).

See also https://bugs.eclipse.org/bugs/show_bug.cgi?id=565774

Author: staktrace

gradle.properties

@@ -22,7 +22,7 @@ VER_SLF4J=[1.6,2.0[
 
 # Used in multiple places
 VER_DURIAN=1.2.0
-VER_JGIT=5.10.0.202012080955-r
+VER_JGIT=5.13.0.202109080827-r
 VER_JUNIT=5.8.0
 VER_ASSERTJ=3.15.0
 VER_MOCKITO=3.3.3