Update pytest filterwarnings to fail on warnings originating from Parcels code

[VeckoTheGecko]

Fix warnings in Parcels as a result of the Parcels test suite and update Pytest settings to fail on warnings.

diff --git a/pyproject.toml b/pyproject.toml
index ca43f03b..c87b4d36 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,6 +65,7 @@ markers = [ # can be skipped by doing `pytest -m "not slow"` etc.
 
 filterwarnings = [
   "error:.*removed in a future release of Parcels.*:DeprecationWarning", # Have Parcels DeprecationWarnings fail CI (prevents deprecated items being used in internal code)
+  "error:::parcels.*",
 ]
 
 [tool.ruff]

This will ensure that users don't get warnings when running Parcels code, and also makes sure that we're on top of deprecations etc.