Bump jsoup from 1.12.1 to 1.15.3

Bumps [jsoup](https://github.com/jhy/jsoup) from 1.12.1 to 1.15.3.
- [Release notes](https://github.com/jhy/jsoup/releases)
- [Changelog](https://github.com/jhy/jsoup/blob/master/CHANGES)
- [Commits](https://github.com/jhy/jsoup/compare/jsoup-1.12.1...jsoup-1.15.3)

---
updated-dependencies:
- dependency-name: org.jsoup:jsoup
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 861e3c1..6db5df8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -362,7 +362,7 @@
       <dependency>
         <groupId>org.jsoup</groupId>
         <artifactId>jsoup</artifactId>
-        <version>1.12.1</version>
+        <version>1.15.3</version>
       </dependency>
       <dependency>
         <groupId>net.sf.biweekly</groupId>