build(deps): bump pmd.version from 6.49.0 to 7.8.0

Bumps `pmd.version` from 6.49.0 to 7.8.0.

Updates `net.sourceforge.pmd:pmd-core` from 6.49.0 to 7.8.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/main/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/6.49.0...pmd_releases/7.8.0)

Updates `net.sourceforge.pmd:pmd-java` from 6.49.0 to 7.8.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/main/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/6.49.0...pmd_releases/7.8.0)

Updates `net.sourceforge.pmd:pmd-xml` from 6.49.0 to 7.8.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/main/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/6.49.0...pmd_releases/7.8.0)

---
updated-dependencies:
- dependency-name: net.sourceforge.pmd:pmd-core
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: net.sourceforge.pmd:pmd-java
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: net.sourceforge.pmd:pmd-xml
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

pom.xml

@@ -47,7 +47,7 @@
     <maven.compiler.target>1.8</maven.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-    <pmd.version>6.49.0</pmd.version>
+    <pmd.version>7.8.0</pmd.version>
     <jackson.version>2.18.1</jackson.version>
     <dependency.locations.enabled>false</dependency.locations.enabled>
     <coverageThreshold>75</coverageThreshold>