Point to correct JGit API docs version

* Update API docs version
* Point to JGit API docs archive url

Release-Notes: skip
Change-Id: I73b58ee61aee9c60b13b9dc67c958c9e0c6df31f

java/com/google/gerrit/extensions/BUILD

diff --git a/java/com/google/gerrit/extensions/BUILD b/java/com/google/gerrit/extensions/BUILD
index f36018b..762df80 100644
--- a/java/com/google/gerrit/extensions/BUILD
+++ b/java/com/google/gerrit/extensions/BUILD
@@ -2,9 +2,9 @@
 load("//tools:nongoogle.bzl", "GUAVA_DOC_URL")
 load("//tools/bzl:javadoc.bzl", "java_doc")
 
-_DOC_VERS = "5.5.0.201909110433-r"
+_DOC_VERS = "6.1.0.202203080745-r"
 
-JGIT_DOC_URL = "https://download.eclipse.org/jgit/site/" + _DOC_VERS + "/apidocs"
+JGIT_DOC_URL = "https://archive.eclipse.org/jgit/site/" + _DOC_VERS + "/apidocs"
 
 java_binary(
     name = "extension-api",