build(deps): bump structlog from 20.2.0 to 21.1.0 (#569)

Bumps [structlog](https://github.com/hynek/structlog) from 20.2.0 to 21.1.0.
- [Release notes](https://github.com/hynek/structlog/releases)
- [Changelog](https://github.com/hynek/structlog/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/hynek/structlog/compare/20.2.0...21.1.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Pipfile.lock

@@ -1123,11 +1123,11 @@
         },
         "structlog": {
             "hashes": [
-                "sha256:33dd6bd5f49355e52c1c61bb6a4f20d0b48ce0328cc4a45fe872d38b97a05ccd",
-                "sha256:af79dfa547d104af8d60f86eac12fb54825f54a46bc998e4504ef66177103174"
+                "sha256:62f06fc0ee32fb8580f0715eea66cb87271eb7efb0eaf9af6b639cba8981de47",
+                "sha256:d9d2d890532e8db83c6977a2a676fb1889922ff0c26ad4dc0ecac26f9fafbc57"
             ],
             "index": "pypi",
-            "version": "==20.2.0"
+            "version": "==21.1.0"
         },
         "swagger-spec-validator": {
             "hashes": [