build(deps): bump attrs from 20.3.0 to 21.2.0

Bumps [attrs](https://github.com/python-attrs/attrs) from 20.3.0 to 21.2.0.
- [Release notes](https://github.com/python-attrs/attrs/releases)
- [Changelog](https://github.com/python-attrs/attrs/blob/main/CHANGELOG.rst)
- [Commits](python-attrs/attrs@20.3.0...21.2.0)

---
updated-dependencies:
- dependency-name: attrs
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 SQLAlchemy == 1.4.22
-attrs == 20.3.0
+attrs == 21.2.0
 beautifulsoup4 == 4.9.3
 chardet == 4.0.0
 cleverwrap == 0.3.0.2