Depends on SR#895859

- Update to version 0.7.0+0:
  * Add new b4 pr flags
  * Check uids on the key when using default keyring
  * Update attestation section in the README
  * Don't depend on List-Archive lore header
  * Handle situations where -f only has an email
  * Fix pr -l where we introduced var collision
  * Bump patatt to 0.4.2
  * Avoid type error when local mbox lacks specified message ID
  * Tweak lore.kernel.org match
  * Return early if no messages retrieved
  * Strip any List-* headers matching lore
  * Move --show-keys into its own kr subcommand
  * Handle partial reroll of series without cover
  * Don't crash on absent cover letter
  * Warn when we find an "Obsoleted-by" trailer
  * Reimplement single-msgid cherrypicking
  * Initial support for Obsoleted-by: trailer
  * Cherrypick from the correct series revision
  * Write maildir atomically
  * Minor visual tweak in output
  * Fix a crash on incomplete/missing threads
  * Tweak output filenames
  * Document save-maildirs and -M options
  * Don't use mboxo for anything
  * Allow passing entire mbox via stdin
  * Perform mboxo unescaping before DKIM check
  * Implement partial reroll
  * Don't try to read stdin multiple times
  * Restore check for attestation-check-dkim
  * Improve subject parsing for bracketed prefixes
  * Ensure trailers are tracked with source messages
  * Fix DKIM check on headers that don't lowercase h
  * Properly fail with BADSIG on bad signature
  * Force datetime to UTC if it's native
  * Fix crash when PGP key not in default keyring
  * Clean up after ourselves
  * Rudimentary support for showing patatt key info
  * Fix for DKIM signatures without t= field
  * Reimplement attestation-staleness-days
  * Python 3.6 compatibility fixes
  * Remove sendemail-validte hook
  * Reimplement attestation code one more time
  * Loosen compatible release identifiers for install_requires
  * Save to/cc headers as-is for tracking
  * Add -f to "b4 mbox" to filter dupes
  * Check if -o is a maildir
  * Recognize merged PRs when attempting auto-base
  * Raise RuntimeError instead of exiting
  * Convert mboxrd to mboxo
  * Allow passing extra opts to git-format-patch
  * Fix crasher when we don't use -g with b4 pr
  * Rework b4 pr exploder for transparency log needs
  * DKIM: remove extra public-inbox headers
  * Only check allow-list of trailers in follow-ups
  * Add BugLink to non-person trailers

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