* LockFile: create OutputStream only when needed

* 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

* UploadPack: Use more relevant refs first in object reachability check
* UploadPack: Refactor to generalize the object reachability checks
* UploadPack: Use BitmappedReachabilityChecker for not advertised wants
* revwalk: Introduce bitmap-based object reachability checker
* revwalk: Extract ObjectReachabilityChecker interface
* UploadPack: Extract walk-based reachability check

* Prepare 5.3.8-SNAPSHOT builds

* Merge branch 'stable-5.6'

* Add ReftableNumbersNotIncreasingException#toString

* Merge branch 'stable-5.5'

* JGit v5.1.11.201909031202-r

* Merge branch 'stable-5.1' into stable-5.2

* Consistently use "!isEmpty()" to detect non-empty list
* TransportHttp: Check for non-empty list with "!isEmpty()" rather than "size() > 0"
* TransportHttp: Fix comparison of size with ">= 0"

* ObjectWalk: simplify tree traversal logic
* Expose and pass around the FilterSpec object rather than the raw blob limit
* Put filter spec information in a dedicated object

* Apache MINA sshd client: test & fix password authentication
* Move SshTestGitServer to new bundle org.eclipse.jgit.junit.ssh
* Apache MINA sshd client: proxy support

* Silence API errors introduced by f648a3bd

* BlockListTest: Add missing calls to fail()
* DirCacheBuilderTest#testBuildRejectsUnsetFileMode: Add missing fail()
* DirCacheCheckoutTest#testCheckoutHierarchy: Add missing call to fail()
* ConfigTest: Fix tests for getting empty config value as int
* FileResolverTest#testNotAGitRepository: Fail when exception is not thrown

* Return parsed objects from TestRepository.commit/tree/blob()

* Upgrade maven-dependency-plugin to 3.0.2
* Upgrade maven-shade-plugin to 3.1.0

* Add tests for updating single refs to missing objects
* Fix deleting symrefs
* RefDirectory: Throw exception if CAS of packed ref list fails
* ReceiveCommand: Explicitly check constructor preconditions
* BatchRefUpdate: Document when getPushOptions is null

* Clone: add --recurse-submodules option

* Reintroduce garbage pack coalescing when ttl > 0.

* Fix config value get to return last instead of 1st just like git

* [cli] Use chaining credentials provider to enable .netrc

* Windows: Hide the .git directory if hidedotfiles is set to non-false

* JGit v3.0.0.201305080800-m7

* Do not install unnecessary Orbit bundles

* Add percent-encoding of reserved characters in URIish