Update dependency pytest to v8 (#12)

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

Author: renovate[bot]

poetry.lock

@@ -15,7 +15,7 @@ black = "^24.0.0"
 mypy = "^1.3.0"
 ruff = "^0.9.0"
 pydantic-settings = "^2.3.0"
-pytest = "^7.4.2"
+pytest = "^8.0.0"
 # specklepy = { path = "../specklepy", develop = true }
 
 [build-system]