Bump org.eclipse.platform:org.eclipse.help.base from 4.4.300 to 4.4.400

Bumps [org.eclipse.platform:org.eclipse.help.base](https://github.com/eclipse-platform/eclipse.platform) from 4.4.300 to 4.4.400.
- [Commits](https://github.com/eclipse-platform/eclipse.platform/commits)

---
updated-dependencies:
- dependency-name: org.eclipse.platform:org.eclipse.help.base
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

tycho-extras/tycho-document-bundle-plugin/pom.xml

@@ -59,7 +59,7 @@
 		<dependency>
 			<groupId>org.eclipse.platform</groupId>
 			<artifactId>org.eclipse.help.base</artifactId>
-			<version>4.4.300</version>
+			<version>4.4.400</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.pde</groupId>