A transitive dependency is still sneaking in somehow

Use strictly to force the issue.

Signed-off-by: Antony Denyer <git@antonydenyer.co.uk>

acceptance-tests/tests/build.gradle

@@ -11,10 +11,6 @@
  * specific language governing permissions and limitations under the License.
  */
 
-buildscript {
-  configurations.classpath { resolutionStrategy { force 'org.web3j:core:4.9.4' } }
-}
-
 plugins {
   id 'org.web3j' version '4.9.2'
   id 'org.web3j.solidity' version '0.3.5'
@@ -78,6 +74,10 @@ dependencies {
   testImplementation 'org.web3j:besu'
   testImplementation 'org.web3j:core'
 
+  implementation('org.web3j:core') {
+    version { strictly('4.9.4') }
+  }
+
   testRuntimeOnly 'org.junit.vintage:junit-vintage-engine'
 }