chore: Set bundle required environment to JavaSE-1.8 (#334)

Author: jdneo

jdtls.ext/com.microsoft.jdtls.ext.activator/.classpath

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
 	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
 	<classpathentry kind="src" path="src/"/>
 	<classpathentry kind="output" path="target/classes"/>

jdtls.ext/com.microsoft.jdtls.ext.activator/META-INF/MANIFEST.MF

@@ -4,7 +4,7 @@ Bundle-Name: JDTLS EXT Activator
 Bundle-SymbolicName: com.microsoft.jdtls.ext.activator;singleton:=true
 Bundle-Version: 0.13.0
 Bundle-Activator: com.microsoft.jdtls.ext.activator.JdtlsExtActivator
-Bundle-RequiredExecutionEnvironment: JavaSE-11
+Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Import-Package: org.eclipse.jdt.core,
  org.osgi.framework;version="1.3.0"
 Require-Bundle: org.eclipse.core.runtime,

jdtls.ext/com.microsoft.jdtls.ext.core/.classpath

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
 	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
 	<classpathentry kind="src" path="src/"/>
 	<classpathentry exported="true" kind="lib" path="lib/commons-io-2.5.jar"/>

jdtls.ext/com.microsoft.jdtls.ext.core/.settings/org.eclipse.core.resources.prefs

@@ -4,7 +4,7 @@ Bundle-Name: JDTLS EXT Core
 Bundle-SymbolicName: com.microsoft.jdtls.ext.core;singleton:=true
 Bundle-Version: 0.13.0
 Bundle-Activator: com.microsoft.jdtls.ext.core.JdtlsExtActivator
-Bundle-RequiredExecutionEnvironment: JavaSE-11
+Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Bundle-ActivationPolicy: lazy
 Import-Package: org.eclipse.jdt.core,
  org.eclipse.jdt.launching,