Enforce up-to-date Guava in buildSrc (opensearch-project#9335)

Guava is a transitive dependency of spotless via google-java-format, the version that was being pulled in has CVE-2023-2976.
While this would not affect end users it causes excess alerts.

Signed-off-by: Thomas Farr <tsfarr@amazon.com>
(cherry picked from commit 1342578)

buildSrc/build.gradle

@@ -156,6 +156,12 @@ dependencies {
   }
 }
 
+configurations.all {
+  resolutionStrategy {
+    force "com.google.guava:guava:${props.getProperty('guava')}"
+  }
+}
+
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