Update gson version in org.eclipse.jgit.lfs.server manifest

Commit f3bb0e2 upgraded gson to 2.8.2 but did not update the LFS
server manifest file to require 2.8. Also accept 2.8.0 which should be
API compatible with 2.8.2 which is the version we ship with the p2
repository.

Change-Id: I734496c4826739f9bc6a790b9d2c70e549c0e559
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.lfs.server/META-INF/MANIFEST.MF

@@ -19,7 +19,7 @@ Export-Package: org.eclipse.jgit.lfs.server;version="4.11.0";
   uses:="org.eclipse.jgit.lfs.server,
    org.eclipse.jgit.lfs.lib"
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Import-Package: com.google.gson;version="[2.2.4,3.0.0)",
+Import-Package: com.google.gson;version="[2.8.0,3.0.0)",
  javax.servlet;version="[3.1.0,4.0.0)",
  javax.servlet.annotation;version="[3.1.0,4.0.0)",
  javax.servlet.http;version="[3.1.0,4.0.0)",