update language level

plugins/com.minres.scviewer.e4.application/META-INF/MANIFEST.MF

@@ -36,7 +36,7 @@ Require-Bundle: javax.inject;bundle-version="1.0.0",
  org.eclipse.equinox.p2.engine;bundle-version="2.6.600",
  org.eclipse.equinox.p2.operations;bundle-version="2.5.700",
  org.eclipse.equinox.p2.metadata.repository;bundle-version="1.3.400"
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
+Bundle-RequiredExecutionEnvironment: JavaSE-11
 Import-Package: com.minres.scviewer.database,
  javax.inject;version="1.0.0"
 Automatic-Module-Name: com.minres.scviewer.e4.application