Bump io.jenkins.plugins:flatpickr-api

Bumps [io.jenkins.plugins:flatpickr-api](https://github.com/jenkinsci/flatpickr-api-plugin) from 4.6.13-5.v534d8025a_a_59 to 4.6.13-15.vf6e534338831.
- [Release notes](https://github.com/jenkinsci/flatpickr-api-plugin/releases)
- [Commits](https://github.com/jenkinsci/flatpickr-api-plugin/commits/4.6.13-15.vf6e534338831)

---
updated-dependencies:
- dependency-name: io.jenkins.plugins:flatpickr-api
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -69,7 +69,7 @@
     <dependency>
       <groupId>io.jenkins.plugins</groupId>
       <artifactId>flatpickr-api</artifactId>
-      <version>4.6.13-5.v534d8025a_a_59</version>
+      <version>4.6.13-15.vf6e534338831</version>
     </dependency>
     <dependency>
       <groupId>com.cronutils</groupId>