Bump tycho-p2-repository-plugin from 2.7.3 to 2.7.4 (#8309)

Bumps tycho-p2-repository-plugin from 2.7.3 to 2.7.4.

---
updated-dependencies:
- dependency-name: org.eclipse.tycho:tycho-p2-repository-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

jetty-p2/pom.xml

@@ -12,7 +12,7 @@
   <description>Generates a (maven based) P2 Updatesite</description>
   <packaging>pom</packaging>
   <properties>
-    <tycho-version>2.7.3</tycho-version>
+    <tycho-version>2.7.4</tycho-version>
   </properties>
   <build>
     <plugins>