build(deps): bump org.eclipse.xtext from 2.26.0 to 2.27.0 in /api-editor (#545)

Bumps [org.eclipse.xtext](https://github.com/eclipse/xtext-core) from 2.26.0 to 2.27.0.
- [Release notes](https://github.com/eclipse/xtext-core/releases)
- [Commits](eclipse-archived/xtext-core@v2.26.0...v2.27.0)

---
updated-dependencies:
- dependency-name: org.eclipse.xtext:org.eclipse.xtext
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

api-editor/backend/build.gradle.kts

@@ -39,7 +39,7 @@ dependencies {
 
     // We can later pull this from Maven Central (or some other repo) once published
     implementation(files("lib/de.unibonn.simpleml-1.0.0-SNAPSHOT.jar"))
-    implementation("org.eclipse.xtext:org.eclipse.xtext:2.26.0")
+    implementation("org.eclipse.xtext:org.eclipse.xtext:2.27.0")
 
     testImplementation(kotlin("test"))
     testImplementation("io.kotest:kotest-assertions-core-jvm:5.2.3")