Bump org.fhir:ucum from 1.0.8 to 1.0.9 (#79)

Bumps [org.fhir:ucum](https://github.com/FHIR/Ucum-java) from 1.0.8 to 1.0.9.
- [Release notes](https://github.com/FHIR/Ucum-java/releases)
- [Changelog](https://github.com/FHIR/Ucum-java/blob/master/release-branch-pipeline.yml)
- [Commits](FHIR/Ucum-java@1.0.8...1.0.9)

---
updated-dependencies:
- dependency-name: org.fhir:ucum
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -21,7 +21,7 @@ dependencies {
     implementation("com.squareup.okhttp3", "okhttp", "4.12.0")
 
     // validator dependency needed to prevent a ClassNotFoundException
-    implementation("org.fhir:ucum:1.0.8")
+    implementation("org.fhir:ucum:1.0.9")
 
     // GSON for our JSON needs
     implementation("com.google.code.gson", "gson", "2.11.0")