* [spotbugs] Silence CN_IMPLEMENTS_CLONE_BUT_NOT_CLONEABLE in jgit tests

* [spotbugs] Silence NP_BOOLEAN_RETURN_NULL in FakeUserAuthGSS#doAuth

* [spotbugs] Fix FileReftableStack#equals to check for null

* [spotbugs] FileReftableDatabase: extract lock to local variable

* [spotbugs] DfsReftableDatabase: extract lock to local variable

* [spotbugs] Silence NP_BOOLEAN_RETURN_NULL in IgnoreNode#checkIgnored

* [spotbugs] Silence warning DLS_DEAD_LOCAL_STORE in generated classes

* [spotbugs] Silence warning about unwritten field written by gson

* Merge branch 'stable-5.10'

* Revert "Remove unused API problem filters"

* Remove unused API problem filters

* [spotbugs] Fix potential NPE in FS#write

* [spotbugs] Fix potential NPE in PackFileSnapshotTest

* [spotbugs] Fix potential NPEs in FileReftableStackTest

* [spotbugs] Fix potential NPE in WorkingTreeIterator#isModified

* [spotbugs] Fix potential NPE in FileBasedConfigTest

* Update jgit-4.18 target platform to use release repository

* [spotbugs] Fix potential NPE in GcPruneNonReferencedTest

* [spotbugs] Fix potential NPE in FileRepository#convertToReftable

* [spotbugs] silence warnings for intended use of == to compare strings

* [spotbugs] silence short-circuit warning in PackOutputStream#write

* [spotbugs]  parse time using thread-safe DateTimeFormatter

* FetchProcess#execute: fix formatting

* [errorprone] FetchProcess: ensure exception isn't suppressed

* [errorprone] WalkFetchConnection: ensure exception isn't suppressed

* Remove unused API problem filters
* Remove reftree and ketch
* LsRemote: suppress warning for non-externalized string
* LooseObjects: fix formatting

* Split out loose object handling from ObjectDirectory

* Merge branch 'stable-5.9'

* Fix stamping to produce stable file timestamps

* PackDirectory: fix formatting
* Split out packfile handling from ObjectDirectory

* TagCommand: propagate NO_CHANGE information
* TagCommand: make -f work with lightweight tags for NO_CHANGE

* Merge branch 'stable-5.10'

* Prepare 5.10.1-SNAPSHOT builds

* JGit v5.10.0.202012080955-r

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

* Merge branch 'stable-5.10'

* Prepare 5.11.0-SNAPSHOT builds

* Prepare 5.10.0-SNAPSHOT builds

* JGit v5.10.0.202012021225-rc1

* Merge branch 'master' into next

* Don't install 3rd party dependency bundles via features

* Merge branch 'master' into stable-5.10

* Merge branch 'stable-5.9'

* Merge branch 'stable-5.8' into stable-5.9

* Merge branch 'stable-5.7' into stable-5.8

* Merge branch 'stable-5.6' into stable-5.7

* Merge branch 'stable-5.5' into stable-5.6

* Merge branch 'stable-5.4' into stable-5.5

* Merge branch 'stable-5.3' into stable-5.4

* Prepare 5.3.10-SNAPSHOT builds