Bump com.github.spotbugs from 6.0.6 to 6.0.9

Bumps com.github.spotbugs from 6.0.6 to 6.0.9.

---
updated-dependencies:
- dependency-name: com.github.spotbugs
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -3,7 +3,7 @@ plugins {
     id 'io.spring.dependency-management' version '1.1.4'
     id 'java'
     id 'jacoco'
-    id 'com.github.spotbugs' version '6.0.6'
+    id 'com.github.spotbugs' version '6.0.9'
 }
 
 group = 'uk.nhs.prm.deductions'