Bump logback-core from 1.2.2 to 1.2.9 in /tiles-request-api

Bumps logback-core from 1.2.2 to 1.2.9.

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-core
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/tiles-request-api/pom.xml b/tiles-request-api/pom.xml
index de06673..90aa6a2 100644
--- a/tiles-request-api/pom.xml
+++ b/tiles-request-api/pom.xml
@@ -86,7 +86,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-core</artifactId>
-            <version>1.2.2</version>
+            <version>1.2.9</version>
             <scope>test</scope>
         </dependency>
         <dependency>