Bump BWC test version to 2.8 (#1668)

Signed-off-by: Peng Huo <[email protected]>

Author: penghuo

integ-test/build.gradle

@@ -38,7 +38,7 @@ apply plugin: 'java'
 apply plugin: 'io.freefair.lombok'
 apply plugin: 'com.wiredforcode.spawn'
 
-String baseVersion = "2.7.0"
+String baseVersion = "2.8.0"
 String bwcVersion = baseVersion + ".0";
 String baseName = "sqlBwcCluster"
 String bwcFilePath = "src/test/resources/bwc/"