Bump karafVersion from 4.4.3 to 4.4.4 (#315)

Bumps `karafVersion` from 4.4.3 to 4.4.4.

Updates `org.apache.karaf.features:standard` from 4.4.3 to 4.4.4

Updates `org.apache.karaf.features:org.apache.karaf.features.core` from 4.4.3 to 4.4.4

---
updated-dependencies:
- dependency-name: org.apache.karaf.features:standard
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.karaf.features:org.apache.karaf.features.core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -35,7 +35,7 @@ ext {
     /* OSGi */
     camelVersionRange = "[3.0,4)"
     jenaVersionRange = "[3.13,5)"
-    karafVersion = '4.4.3'
+    karafVersion = '4.4.4'
     osgiVersion = '8.0.0'
     osgiCompendiumVersion = '5.0.0'
     paxExamVersion = '4.13.5'