Bump cel-bom from 0.3.13 to 0.3.15 (#557)

.github/dependabot.yml

@@ -17,6 +17,8 @@ updates:
       # See issue #510
       - dependency-name: "com.github.jnr:jnr-ffi"
         versions: [ "2.2.13" ]
+      - dependency-name: "org.projectnessie.cel:cel-bom"
+        versions: [ "0.3.14", "0.3.15" ]
   - package-ecosystem: maven
     # workaround for non-standard pom.xml filename (https://github.com/dependabot/dependabot-core/issues/4425)
     directory: "/.github/planetiler-examples-dependabot"