Fix compatibility with Gradle 7.5.1 caused by multi-release JAR

We still want to keep support for Gradle 7.5.1 a little longer. Gradle version older than 7.6.4 fail when trying to use multi-release JARs which contain code for JDKs which that Gradle doesn't support: gradle/gradle#24390. Starting with version 2.15, Jackson publishes such JARs.

Downgrading to version 2.14 is not an issue, as we don't use any fancy features. This version is fairly recent (May 2023) and doesn't have any known vulnerabilities.

build.gradle.kts

@@ -64,13 +64,13 @@ gradlePlugin {
 }
 
 dependencies {
-    implementation("com.fasterxml.jackson.core:jackson-databind:2.16.0")
+    implementation("com.fasterxml.jackson.core:jackson-databind:2.14.3")
 
     testImplementation("org.spockframework:spock-core:2.2-groovy-3.0") {
         exclude(group = "org.codehaus.groovy")
     }
     testImplementation("org.spockframework:spock-junit4:2.0-groovy-3.0")
-    testImplementation("com.fasterxml.jackson.core:jackson-databind:2.16.0")
+    testImplementation("com.fasterxml.jackson.core:jackson-databind:2.14.3")
 }
 
 tasks.withType<Test> {