Bump org.eclipse.platform:org.eclipse.equinox.p2.updatesite

Bumps [org.eclipse.platform:org.eclipse.equinox.p2.updatesite](https://github.com/eclipse-equinox/p2) from 1.3.300 to 1.3.400.
- [Commits](https://github.com/eclipse-equinox/p2/commits)

---
updated-dependencies:
- dependency-name: org.eclipse.platform:org.eclipse.equinox.p2.updatesite
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

p2-maven-plugin/pom.xml

@@ -101,7 +101,7 @@
 		<dependency>
 			<groupId>org.eclipse.platform</groupId>
 			<artifactId>org.eclipse.equinox.p2.updatesite</artifactId>
-			<version>1.3.300</version>
+			<version>1.3.400</version>
 		</dependency>
 		<!-- used API packages from Tycho -->
 		<dependency>