Bump fr.inria.gforge.spoon:spoon-core (#127)

Bumps fr.inria.gforge.spoon:spoon-core from 10.4.3-beta-18 to 10.4.3-beta-21.

---
updated-dependencies:
- dependency-name: fr.inria.gforge.spoon:spoon-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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build.gradle

@@ -14,7 +14,7 @@ repositories {
 }
 
 dependencies {
-    implementation "fr.inria.gforge.spoon:spoon-core:10.4.3-beta-18"
+    implementation "fr.inria.gforge.spoon:spoon-core:10.4.3-beta-21"
     implementation "com.google.code.gson:gson:2.10.1"
     implementation "com.google.googlejavaformat:google-java-format:1.21.0"
     implementation "org.slf4j:slf4j-api:2.0.12"