Bump org.eclipse.jgit:org.eclipse.jgit in /core

Bumps org.eclipse.jgit:org.eclipse.jgit from 5.2.1.201812262042-r to 6.6.1.202309021850-r.

---
updated-dependencies:
- dependency-name: org.eclipse.jgit:org.eclipse.jgit
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

core/pom.xml

@@ -184,7 +184,7 @@
         <dependency>
             <groupId>org.eclipse.jgit</groupId>
             <artifactId>org.eclipse.jgit</artifactId>
-            <version>5.2.1.201812262042-r</version>
+            <version>6.6.1.202309021850-r</version>
         </dependency>
         <dependency>
             <groupId>org.json</groupId>