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