MAINT: Set Pixi relative exclude-newer (#2572)

Author: VeckoTheGecko

pixi.toml

@@ -1,9 +1,10 @@
 [workspace]
 name = "Parcels"
+exclude-newer = "5d" # security pre-caution against compromised packages
 preview = ["pixi-build"]
 channels = ["conda-forge"]
 platforms = ["win-64", "linux-64", "osx-64", "osx-arm64"]
-requires-pixi = ">=0.63.0"
+requires-pixi = ">=0.67.0"
 
 [package]
 name = "parcels"