Automatic update for snapd-2.51.7-1.fc36.

Changelog

* Wed Sep  1 2021 Maciek Borzecki <maciek.borzecki@gmail.com> - 2.51.7-1
- New upstream release 2.51.7 (RHBZ#1972558)
- Include an upstream fix for squashfs 4.5+ compatibility (RHBZ#1999998)
* Fri Aug 27 2021 Ian Johnson <ian.johnson@canonical.com>
- New upstream release 2.51.7
 - cmd/snap-seccomp/syscalls: update syscalls list to libseccomp
   v2.2.0-428-g5c22d4b1
 - tests: cherry-pick shellcheck fix `bd730fd4`
 - interfaces/dsp: add /dev/ambad into dsp interface
 - many: shellcheck fixes
 - snapstate: abort kernel refresh if no gadget update can be found
 - overlord: add manager test for "assumes" checking
 - store: deal correctly with "assumes" from the store raw yaml
* Thu Aug 19 2021 Ian Johnson <ian.johnson@canonical.com>
- New upstream release 2.51.6
 - secboot: use half the mem for KDF in AddRecoveryKey
 - secboot: switch main key KDF memory cost to 32KB
* Mon Aug 16 2021 Ian Johnson <ian.johnson@canonical.com>
- New upstream release 2.51.5
 - snap/squashfs: handle squashfs-tools 4.5+
 - tests/core20-install-device-file-install-via-hook-hack: adjust
   test for 2.51
 - o/devicestate/handlers_install.go: add workaround to create dirs
   for install
 - tests: fix linter warning
 - tests: update other spread tests for new behaviour
 - tests: ack assertions by default, add --noack option
 - release-tools/changelog.py: also fix opensuse changelog date
   format
 - release-tools/changelog.py: fix typo in function name
 - release-tools/changelog.py: fix fedora date format
 - release-tools/changelog.py: handle case where we don't have a TZ
 - release-tools/changelog.py: fix line length check
 - release-tools/changelog.py: specify the LP bug for the release as
   an arg too
 - interface/modem-manager: add support for MBIM/QMI proxy
   clients
 - .github/workflows/test.yaml: use snapcraft 4.x to build the snapd
   snap
* Mon Aug  9 2021 Ian Johnson <ian.johnson@canonical.com>
- New upstream release 2.51.4
 - {device,snap}state: skip kernel extraction in seeding
 - vendor: move to snapshot-4c814e1 branch and set fixed KDF options
 - tests/interfaces/tee: fix HasLen check for udev snippets
 - interfaces/tee: add support for Qualcomm qseecom device node
 - gadget: check for system-save with multi volumes if encrypting
   correctly
 - gadget: drive-by: drop unnecessary/supported passthrough in test
   gadget.yaml