abi_check.sh: Update version number for automatic abi check (2.5.2->2.5.3)

Author: rouault

tools/travis-ci/abi-check.sh

@@ -24,8 +24,8 @@ if [ "${OPJ_CI_CXX:-}" != "" ]; then
 fi
 
 OPJ_UPLOAD_ABI_REPORT=0
-#OPJ_PREVIOUS_VERSION="2.5.0"
-OPJ_LATEST_VERSION="2.5.1"
+OPJ_PREVIOUS_VERSION="2.5.2"
+OPJ_LATEST_VERSION="2.5.3"
 if [ "${OPJ_PREVIOUS_VERSION:-}" != "" ]; then
 	OPJ_LIMIT_ABI_BUILDS="-limit 3"
 else