chore(deps): bump io.ktor:ktor-server-default-headers in /appengine/ktor

Bumps [io.ktor:ktor-server-default-headers](https://github.com/ktorio/ktor) from 2.3.9 to 3.0.3.
- [Release notes](https://github.com/ktorio/ktor/releases)
- [Changelog](https://github.com/ktorio/ktor/blob/main/CHANGELOG.md)
- [Commits](ktorio/ktor@2.3.9...3.0.3)

---
updated-dependencies:
- dependency-name: io.ktor:ktor-server-default-headers
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

appengine/ktor/build.gradle.kts

@@ -17,7 +17,7 @@ dependencies {
     implementation("io.ktor:ktor-server-servlet")
     implementation("io.ktor:ktor-server-html-builder")
     implementation("io.ktor:ktor-server-call-logging:2.3.9")
-    implementation("io.ktor:ktor-server-default-headers:2.3.9")
+    implementation("io.ktor:ktor-server-default-headers:3.0.3")
     implementation("com.google.cloud:google-cloud-logging-logback:0.131.3-alpha")
 
     runtimeOnly("com.google.appengine:appengine:1.9.98")