Update dependency pytest to v8 (#30)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

poetry.lock

@@ -13,7 +13,7 @@ numpy = "^1.14.0"
 scipy = "^1.6.0"
 
 [tool.poetry.group.dev.dependencies]
-pytest = "^7.4.3"
+pytest = "^8.0.0"
 pre-commit = "^3.5.0"
 
 [build-system]