Set JDK version to 1.8

Resolves: RHEL-35364

ongres-stringprep.spec

@@ -2,7 +2,7 @@
 
 Name:       ongres-%upstream_name
 Version:    1.1
-Release:    13%{?dist}
+Release:    14%{?dist}
 Summary:    RFC 3454 Preparation of Internationalized Strings in pure Java
 License:    BSD-2-Clause AND Apache-2.0
 URL:            https://github.com/ongres/%upstream_name
@@ -47,7 +47,7 @@ find \( -name '*.jar' -o -name '*.class' \) -delete
 %mvn_package com.ongres.stringprep:codegenerator __noinstall
 
 %build
-%mvn_build
+%mvn_build -- -Djava.version=1.8
 
 %install
 %mvn_install
@@ -59,6 +59,9 @@ find \( -name '*.jar' -o -name '*.class' \) -delete
 %license LICENSE
 
 %changelog
+* Thu Aug 01 2024 Marián Konček <mkoncek@redhat.com> - 1.1-14
+- Set JDK version to 1.8
+
 * Mon Jun 24 2024 Troy Dawson <tdawson@redhat.com> - 1.1-13
 - Bump release for June 2024 mass rebuild