Upgrade JGit to 5.1.11.201909031202-r

Improvements in 5.1.8 - 5.1.11:
- include filekey file attribute (inode on *nix filesystems) when
  comparing FileSnapshots
- optionally wait opening new packfile until it can't be racy anymore
- fix FileSnapshot's consideration of file size
- ObjectDirectory: fix closing of obsolete packs
- measure FileStoreAttributes per filesystem
  - improve measuring file timestamp resolution
  - measure minimal racy interval
  - use Instant to increase resolution to 1us (limited by FileTime)
  - persist FileStoreAttributes
  - optional asynchronous measurement of FileStoreAttributes
  - directory - FileStore cache
- cache user and system level gitconfig
- fix supportsAtomicCreateNewFile default to true
- fix non-deterministic hash of archives created by ArchiveCommand
- reproduce racy atomic update in PackedBatchRefUpdate and fix it

Release notes:
https://projects.eclipse.org/projects/technology.jgit/releases/5.1.8
https://projects.eclipse.org/projects/technology.jgit/releases/5.1.9
https://projects.eclipse.org/projects/technology.jgit/releases/5.1.10
https://projects.eclipse.org/projects/technology.jgit/releases/5.1.11

Change-Id: Ia93eaee442096eabdb999c9c9a6fc0edeb10c0fe

lib/jgit/jgit.bzl

@@ -1,6 +1,6 @@
 load("//tools/bzl:maven_jar.bzl", "MAVEN_CENTRAL", "maven_jar")
 
-_JGIT_VERS = "5.1.7.201904200442-r"
+_JGIT_VERS = "5.1.11.201909031202-r"
 
 _DOC_VERS = _JGIT_VERS  # Set to _JGIT_VERS unless using a snapshot
 
@@ -40,28 +40,28 @@ def jgit_maven_repos():
         name = "jgit-lib",
         artifact = "org.eclipse.jgit:org.eclipse.jgit:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "ef1f744a1117e3d8916f3770486502a56d241b16",
-        src_sha1 = "7bf5b5298f8936e959a92f62b5151d58feb9c00a",
+        sha1 = "5aa0e29d7b4db4e6c17e3ddee9bdc8d578f02ef0",
+        src_sha1 = "48ae1f24793a18c94d7b2e335ccdee6f16f8dd09",
         unsign = True,
     )
     maven_jar(
         name = "jgit-servlet",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.http.server:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "8306e221fb50985247138adb8ffb0f4cd74c5e9a",
+        sha1 = "2650749548a85adf53ffa7c334834edf3411d7c7",
         unsign = True,
     )
     maven_jar(
         name = "jgit-archive",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.archive:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "fefb13ab8331cc8b13a15b653b1e057de7d3e514",
+        sha1 = "0eb22173603c141047c790e28f9d8a1df39b8067",
     )
     maven_jar(
         name = "jgit-junit",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.junit:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "f73f1eacc38f8329d9453f1d0353e82404379a89",
+        sha1 = "35f4b77f8e8339da192120ee0b037944b94b4194",
         unsign = True,
     )