Added restriction for 'numpy' dependency to 'numpy<2' after Spencer's…

… suggestion (#146 (comment))

pyproject.toml

@@ -21,7 +21,7 @@ dependencies = [
     "f90nml",
     "mule",
     "netcdf4",
-    "numpy",
+    "numpy <2",
     "scitools-iris",
     "versioneer",
 ]
@@ -51,4 +51,4 @@ style = "pep440"
 versionfile_source = "umpost/_version.py"
 versionfile_build = "umpost/_version.py"
 tag_prefix = ""
-parentdir_prefix = "umpost-"
+parentdir_prefix = "umpost-"