* Optimize RevWalkUtils.findBranchesReachableFrom()

* Add org.eclipse.jetty.util.ajax to target platform and bazel deps

* Update eclipse-jarsigner-plugin to 1.1.7
* Update build-helper-maven-plugin to 3.2.0
* Update maven-enforcer-plugin to 3.0.0-M3
* Update maven-shade-plugin to 3.2.4
* Require latest Maven version 3.6.3
* Update spring-boot-maven-plugin to 2.4.1
* Update maven-surefire plugins to 3.0.0-M5
* Update japicmp-maven-plugin to 0.14.4
* Update spotbugs-maven-plugin to 4.1.4
* Upgrade ecj to 3.24.0
* Upgrade wagon-ssh to 3.4.2; align maven-site-plugin

* Merge branch 'stable-5.9'

* TagCommand: support signing annotated tags
* Enable GpgSigner to also sign tags

* Prepare 5.1.11-SNAPSHOT builds

* Fix NPE in RebaseTodoFile#parseComments
* Fix NPE in ObjectIdOwnerMap#get
* Fix NPE in CommitOnlyTest#getHead
* FileUtils#lastModifiedInstant should not log error if path doesn't exist
* Cache user global and system-wide git configurations
* Avoid setup and saving FileStoreAttributes compete for ~/.gitconfig lock

* Remove duplicate externalized message

* Merge branch 'stable-5.0' into stable-5.1

* Repository: Deprecate the #getAllRefs method

* ChangeIdUtilTest: Remove unused notestCommitDashV

* UntrackedFilesHandler: Fix non-localized string
* Main: Replace deprecated ExampleMode with OptionHandlerFilter
* ObjectCheckerTest: Factor duplicate instances out to constants
* SubmoduleConfigTest: Add additional tests in fetchRecurseToConfigValue
* SubmoduleConfig: Simplify #toConfigValue

* Cleanup: Remove redundant type arguments
* Cleanup: Remove unnecessary $NON-NLS$ tags
* Cleanup: Organize imports
* Partially revert c0ad77d8 "Enhance Eclipse save actions"

* JGit v4.3.1.201605051710-r

* TagCommandTest: Instantiate Git and RevWalk objects in try-with-resource
* BlameCommandTest: Instantiate Git objects in try-with-resource

* [performance] Cache platform name in SystemReader

* Fix error message to include cause if ResetCommand fails

* Fix plugin provider names to conform with release train requirement
* Add missing @since tags for new API methods
* DfsReaderOptions are options for a DFS stored repository

* Refactor DfsReader selection of cached packs
* Fix duplicate objects in "thin+cached" packs from DFS
* Correct progress monitor on "Getting sizes:" phase
* Search for annotated tag reuse first
* Use long for more object counts in PackWriter
* Do not write edge objects to the pack stream