Use 422 status when rejecting Git LFS request

services/git-bridge/src/main/java/uk/ac/ic/wlgitbridge/server/GitLfsHandler.java

@@ -37,7 +37,7 @@ public class GitLfsHandler extends AbstractHandler {
     ) {
       Log.info(method + " <- /<project>.git/info/lfs/objects/batch");
       response.setContentType("application/vnd.git-lfs+json");
-      response.setStatus(406);
+      response.setStatus(422);
       response.getWriter().println("{\"message\": \"ERROR: Git LFS is not supported on Overleaf\"}");
       baseRequest.setHandled(true);
     }

services/git-bridge/src/test/java/uk/ac/ic/wlgitbridge/application/WLGitBridgeIntegrationTest.java

@@ -989,7 +989,7 @@ public class WLGitBridgeIntegrationTest {
         String urlBase = "http://127.0.0.1:" + gitBridgePort;
         HttpPost gitLfsRequest = new HttpPost(urlBase+"/5f2419407929eb0026641967.git/info/lfs/objects/batch");
         HttpResponse gitLfsResponse = client.execute(gitLfsRequest);
-        assertEquals(406, gitLfsResponse.getStatusLine().getStatusCode());
+        assertEquals(422, gitLfsResponse.getStatusLine().getStatusCode());
         HttpEntity entity = gitLfsResponse.getEntity();
         String responseString = EntityUtils.toString(entity, "UTF-8");
         assertTrue(responseString.contains("Git LFS is not supported on Overleaf"));