Bump apache-karaf from 2.3.4 to 4.3.8 in /parent

Bumps apache-karaf from 2.3.4 to 4.3.8.

---
updated-dependencies:
- dependency-name: org.apache.karaf:apache-karaf
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/parent/pom.xml b/parent/pom.xml
index 51a4e72..abd0039 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -44,7 +44,7 @@
 
     <felix.obr.version>1.6.6</felix.obr.version>
 
-    <karaf.version>2.3.4</karaf.version>
+    <karaf.version>4.3.8</karaf.version>
     <aries.proxy.version>1.0.2</aries.proxy.version>
     <aries.util.version>1.1.0</aries.util.version>
     <aries.blueprint.core.version>1.3.0</aries.blueprint.core.version>