Bump publish-to-maven-central to Java 11.

Change-Id: I1546c857f504a409f4528c50a05dc299af322c4c
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
diff --git a/publish-to-maven-central/.classpath b/publish-to-maven-central/.classpath
index fceb480..6073fcf 100644
--- a/publish-to-maven-central/.classpath
+++ b/publish-to-maven-central/.classpath
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<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.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>
diff --git a/publish-to-maven-central/.settings/org.eclipse.jdt.core.prefs b/publish-to-maven-central/.settings/org.eclipse.jdt.core.prefs
index 3a21537..f2525a8 100644
--- a/publish-to-maven-central/.settings/org.eclipse.jdt.core.prefs
+++ b/publish-to-maven-central/.settings/org.eclipse.jdt.core.prefs
@@ -1,11 +1,14 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.compliance=11
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.source=1.8
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=11