Update jgit to c6b0ee04e49c96e0beec4154196c416abcf2bcc9
Update jgit to c6b0ee04e49c96e0beec4154196c416abcf2bcc9

this update to current stable-5.9 contains the following changes:
  fed0ab9ba Use FileSnapshot without using configs for FileBasedConfig
  7828ef349 Revert "RefDirectory.scanRef: Re-use file existence check done in snapshot creation"
  994434a1c Add missing @since tags
  2e5110eda Add missing @since tag
  8924b14d3 Add missing @since tags
  f8f4357d6 Remove unused import in ApacheSshTest
  f1547eec0 Update maven plugins
  fe3071f0e Ignore missing javadoc in test bundles
  38db89142 storage: file: De-duplicate File.exists()+File.isFile()
  f829f5f83 RefDirectory.scanRef: Re-use file existence check done in snapshot creation
  5606a5315 FileSnapshot: Lazy load file store attributes cache
  09c923073 Update eclipse-jarsigner-plugin to 1.3.2
  c213a6628 Fix p2 repository URLs
  122237439 FS: debug logging only if system config file cannot be found
  6aa29d116 Better git system config finding
  4f8d43462 Fix target platforms
  d160e8a93 Fix missing peel-part in lsRefsV2 for loose annotated tags
  5f8c48413 reftable: drop code for truncated reads
  b4782d74f reftable: pass on invalid object ID in conversion
  9c3190ce7 Update eclipse-jarsigner-plugin to 1.3.2
  283c23012 Fix running benchmarks from bazel
  c70c0acb4 Update eclipse-jarsigner-plugin to 1.3.2

d160e8a93 should fix Issue 14861

Bug: Issue 14861
Release-Notes: Update jgit to c6b0ee04e49c96e0beec4154196c416abcf2bcc9
Change-Id: Ia221acf855dfc95816def73d77af212888d700a9

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