build(deps): update JGit from 4.5.7 to 5.13.5

JGit 4.5.7 dates from 2019. 5.13 is the last line that needs only Java 8
APIs, so it works with Android's desugaring; it also fixes
GHSA-3p86-9955-h393 (arbitrary file overwrite on checkout).
GHSA-vrpq-qp53-qv56 (XXE in repo manifest parsing) has no 5.x fix but
the app never parses repo manifests.

API changes:
- SshSessionFactory now requires getType().
- CheckoutCommand.setForce is deprecated; setForceRefUpdate is its
  documented replacement with the same meaning.

JGit 5 references java.lang.management and javax.management, which
Android lacks; R8 flagged them. Both paths are made unreachable rather
than only silenced:
- WindowCache registers JMX statistics by default; Application.onCreate
  now installs a WindowCacheConfig with exposeStatsViaJmx = false.
- GC.gc() takes a PID lock that queries ManagementFactory and would
  throw NoClassDefFoundError on a device. GcOperation now runs the GC
  steps (packRefs, repack, prune) directly; the lock only guards against
  concurrent gc processes, which cannot happen in the app. Aggressive
  packing is dropped.
The R8 -dontwarn rules and the lint baseline entries are added only for
those two now-unreachable references.

JGitBehaviourTest covers the operations' command chains plus the GC
steps and passes on 5.13.5. It now ignores the developer's global git
config, which JGit 5 reads (commit.gpgsign made test commits try to
sign).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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