fix: update dependency mkdocstrings to ^0.28.0

Author: renovate[bot]

pyproject.toml

@@ -22,7 +22,7 @@ python="^3.8"
 # Docs
 mkdocs = { version = "^1.3.0", optional = true }
 mkdocs-material = { version = "^9.0.0", optional = true }
-mkdocstrings = { version = "^0.26.0", optional = true }
+mkdocstrings = { version = "^0.28.0", optional = true }
 mkdocstrings-python = { version = "^1.0.0", optional = true }
 mkdocs-literate-nav = { version = "^0.6.0", optional = true }
 mkdocs-section-index = { version = "^0.3.4", optional = true }