Update structlog requirement from <21.2.0 to <21.5.0

[dependabot]

Updates the requirements on structlog to permit the latest version.

Release notes

Sourced from structlog's releases.

21.4.0

This release is mostly about a regression when importing using a Python interpreter running with the PYTHONOPTIMIZE=2 environment variable set, or as python -OO. The one new feature is kinda neat too, though!

Changes:

• Fixed import when running in optimized mode (PYTHONOPTIMIZE=2 or python -OO). #373
• Added the structlog.threadlocal.bound_threadlocal and structlog.contextvars.bound_contextvars decorator/context managers to temporarily bind key/value pairs to a thread-local and context-local context. #371

Changelog

Sourced from structlog's changelog.

21.4.0 (2021-11-25)

Backward-incompatible changes: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

none

Deprecations: ^^^^^^^^^^^^^

none

Changes: ^^^^^^^^

• Fixed import when running in optimized mode (PYTHONOPTIMIZE=2 or python -OO). [#373](https://github.com/hynek/structlog/issues/373) <https://github.com/hynek/structlog/pull/373>_
• Added the structlog.threadlocal.bound_threadlocal and structlog.contextvars.bound_contextvars decorator/context managers to temporarily bind key/value pairs to a thread-local and context-local context. [#371](https://github.com/hynek/structlog/issues/371) <https://github.com/hynek/structlog/pull/371>_

---

21.3.0 (2021-11-20)

Backward-incompatible changes: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

• structlog switched its packaging to flit <https://flit.readthedocs.io/>_. Users shouldn't notice a difference, but (re-)packagers might.

Deprecations: ^^^^^^^^^^^^^

none

Changes: ^^^^^^^^

• structlog.dev.ConsoleRenderer now has sort_keys boolean parameter that allows to disable the sorting of keys on output. [#358](https://github.com/hynek/structlog/issues/358) <https://github.com/hynek/structlog/pull/358>_

... (truncated)

Commits

• e9e77e8 Prepare 21.4.0
• c31ec11 We don't need that comma
• 2c2bcc3 Fold backwards compatibility policy into changelog
• e5ad4fb Update changelog
• 677b794 Simplify -OO handling
• e45b84b Add structlog.contextvars.bound_contextvars, add missing example to thread-lo...
• 05c4b51 Add example for bound_threadlocal
• a0becf5 Add threadlocal bound context manager (#371)
• 3647f47 GitHub really wants us to use Markdown
• e5507ad Add missing TODO
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

Merging #64 (944ce95) into master (6b69aab) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   97.60%   97.60%           
=======================================
  Files          51       51           
  Lines        1630     1630           
=======================================
  Hits         1591     1591           
  Misses         39       39           

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[dependabot]

Superseded by #67.