add EB 5.3.0

Author: bedroge

easystacks/software.eessi.io/2023.06/eessi-2023.06-eb-5.2.1-001-system.yml

@@ -0,0 +1,5 @@
+easyconfigs:
+  - EasyBuild-5.3.0.eb:
+      options:
+        # see https://github.com/easybuilders/easybuild-easyconfigs/pull/25743
+        from-commit: 5314bc03c2b2b2512f205d96e8d6e3010485133f