Bump org.eclipse.platform:org.eclipse.equinox.app

Bumps [org.eclipse.platform:org.eclipse.equinox.app](https://github.com/eclipse-equinox/equinox) from 1.6.300 to 1.6.400.
- [Commits](https://github.com/eclipse-equinox/equinox/commits)

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

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

p2-maven-plugin/pom.xml

@@ -165,7 +165,7 @@
 		<dependency>
 			<groupId>org.eclipse.platform</groupId>
 			<artifactId>org.eclipse.equinox.app</artifactId>
-			<version>1.6.300</version>
+			<version>1.6.400</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.platform</groupId>

tycho-surefire/org.eclipse.tycho.surefire.osgibooter/pom.xml

@@ -29,7 +29,7 @@
 		<dependency>
 			<groupId>org.eclipse.platform</groupId>
 			<artifactId>org.eclipse.equinox.app</artifactId>
-			<version>1.6.300</version>
+			<version>1.6.400</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.platform</groupId>