Bump org.knowm.xchart:xchart from 3.8.7 to 3.8.8 (#12582)

Bumps [org.knowm.xchart:xchart](https://github.com/knowm/XChart) from 3.8.7 to 3.8.8.
- [Commits](knowm/XChart@xchart-3.8.7...xchart-3.8.8)

---
updated-dependencies:
- dependency-name: org.knowm.xchart:xchart
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -91,7 +91,7 @@ subprojects {
  substanceVersion = "4.5.0"
  wireMockJunit5Version = "1.3.1"
  wireMockVersion = "3.0.1"
- xchartVersion = "3.8.7"
+ xchartVersion = "3.8.8"
  xmlUnitCore = "2.10.0"
  xmlUnitMatchers = "2.10.0"
  }