Fix range of version number generation in test (elastic#56849)

The version number componenent can't equal or exceed the revision
multiplier.
This fixes a the VersionTests unit test.

(cherry picked from commit 7d2331a)

Author: bpintea

x-pack/plugin/sql/sql-client/src/test/java/org/elasticsearch/xpack/sql/client/VersionTests.java

@@ -46,7 +46,7 @@ private static String versionString(byte[] parts) {
     private static byte[] randomVersion() {
         byte[] parts = new byte[3];
         for (int i = 0; i < parts.length; i ++) {
-            parts[i] = (byte) randomIntBetween(0, SqlVersion.REVISION_MULTIPLIER);
+            parts[i] = (byte) randomIntBetween(0, SqlVersion.REVISION_MULTIPLIER - 1);
         }
         return parts;
     }