Update dependency org.hamcrest:hamcrest-core to v3 (#157)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

build.gradle

@@ -28,7 +28,7 @@ dependencies {
   testImplementation "org.spockframework:spock-junit4"  // you can remove this if your code does not rely on old JUnit 4 rules
 
   // optional dependencies for using Spock
-  testImplementation "org.hamcrest:hamcrest-core:2.2"   // only necessary if Hamcrest matchers are used
+  testImplementation "org.hamcrest:hamcrest-core:3.0"   // only necessary if Hamcrest matchers are used
   testRuntimeOnly 'net.bytebuddy:byte-buddy:1.15.8' // allows mocking of classes (in addition to interfaces)
   testRuntimeOnly "org.objenesis:objenesis:3.4"      // allows mocking of classes without default constructor (together with ByteBuddy or CGLIB)
 

pom.xml

@@ -109,7 +109,7 @@
     <dependency> <!-- only required if Hamcrest matchers are used -->
       <groupId>org.hamcrest</groupId>
       <artifactId>hamcrest-core</artifactId>
-      <version>2.2</version>
+      <version>3.0</version>
       <scope>test</scope>
     </dependency>
     <!-- Dependencies used by examples in this project (not required for using Spock) -->