Update to upstream version '6.7.0'
with Debian dir 8213f89ad4e31b5223fc869c1a7da015e482b5b4

This adds several helper methods returning SWHIDs to model objects,
namely:

- SkippedContent.swhid()
- DirectoryEntry.swhid()
- SnapshotBranch.swhid()
- Release.target_swhid()
- Revision.directory_swhid() and Release.parent_swhids()
- OriginVisitStatus.origin_swhid() and
  OriginVisitStatus.snapshot_swhid()

Better using latest mypy release.

Update to upstream version '6.6.3'
with Debian dir 31fdf17d4194de4add0cf4ae2de37d1595575405

Related to swh/meta#4960

See: https://tox.wiki/en/latest/upgrading.html#updating-usage-with-e

Related to swh/meta#4959

Update to upstream version '6.6.2'
with Debian dir e5c2f227d7e6087b3152d6160e9502f4199a6105

Previously when looking up data by key in an ImmutableDict, the inner
tuple storing keys and values was iterated until finding the requested
key.

This is not really efficient when the ImmutableDict contains a lot of
entries, typically for an origin snapshot containing a lot of branches.

So use an inner dictionary to speedup look up by key operations and
improve loader performances.

This fixes python 3.7 support due to poetry, a dependency of isort, that
removed support for that Python version in a recent release.

In order to remove warnings about /apidoc/*.rst files being included
multiple times in toc when building full swh documentation, prefer to
include module indices only when building standalone package documentation.

Also include them the proper sphinx way.

Related to T4496

Update to upstream version '6.6.1'
with Debian dir 5264b8650def64f97ea2b7aae15cadc2dc496623

There were two issues that was preventing to browse some SWHIDs given as
examples in that documentation:

- Some sphinx links were broken in rDMODe1c3fe80731226618616117dfd67a95f3d365645

- A SWHID with ';' in its path qualifier was correctly percent escaped but
  when used as URL argument an extra percent escaping is required as HTTP
  server will unescape URL arguments and thus break SWHID percent escaping.

Closes T4721

from_disk.Content object created for a symlink was missing path info
so ensure to add it for consistency with from_disk.Content object
created for a regular file.

- pre-commit from 4.1.0 to 4.3.0,
- codespell from 2.2.1 to 2.2.2,
- black from 22.3.0 to 22.10.0 and
- flake8 from 4.0.1 to 5.0.4. Also freeze flake8 dependencies.

Also change flake8's repo config to github (the gitlab mirror
being outdated).

Update to upstream version '6.6.0'
with Debian dir 18c244cdb4270a0e59b359f3522dd0a7f1bf55f8

When using attr < 21.3.0, adding field transformer breaks attrs
integration with hypothesis, because attributes transformed with
such function are not casted to generated AttrsClass, but remains
just an list of attributes. This causes error in hypothesis by
raising an AttributeError.

As we use attr 21.2.0 in production and when building debian buster
package, add a workaround for that issue as explained here:
https://github.com/python-attrs/attrs/issues/821.

Previously the MerkleNode.collect method was returning a dict whose keys
are node types and values dict of {<node_hash>: <node_data>}.

In order to give more flexibility to client code for the processing of
collected nodes, prefer to simply return a set of MerkleNode.

As a consequence, MerkleNode objects need to be hashable by Python so
the __hash__ method has also been implemented.

Closes T4633