Bump spock-core from 2.0-groovy-3.0 to 2.1-groovy-3.0 in /modules/spock

Bumps spock-core from 2.0-groovy-3.0 to 2.1-groovy-3.0.

---
updated-dependencies:
- dependency-name: org.spockframework:spock-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

modules/spock/build.gradle

@@ -6,7 +6,7 @@ description = "Testcontainers :: Spock-Extension"
 
 dependencies {
     api project(':testcontainers')
-    api 'org.spockframework:spock-core:2.0-groovy-3.0'
+    api 'org.spockframework:spock-core:2.1-groovy-3.0'
 
     testImplementation project(':selenium')
     testImplementation project(':mysql')