deps: remove pinned versions

pyproject.toml

@@ -14,7 +14,7 @@ packages = ["GeoSpatialTools"]
 name = "GeoSpatialTools"
 version = "0.11.2"
 dependencies = ["numpy"]
-requires-python = ">=3.11"
+requires-python = ">=3.9"
 authors = [
   { name = "Joseph Siddons", email = "josidd@noc.ac.uk" },
   { name = "Richard Cornes", email = "rcornes@noc.ac.uk" },
@@ -33,19 +33,19 @@ classifiers = [
 
 [project.optional-dependencies]
 notebooks = ["ipykernel", "polars"]
-test = ["pytest>=8.3.4"]
+test = ["pytest"]
 docs = [
-  "sphinx>=8.2.1",
-  "sphinx-autodoc-typehints>=3.1.0",
-  "sphinx-rtd-theme>=3.0.2",
+  "sphinx",
+  "sphinx-autodoc-typehints",
+  "sphinx-rtd-theme",
 ]
 all = [
   "ipykernel",
   "polars",
   "pytest",
-  "sphinx>=8.2.1",
-  "sphinx-autodoc-typehints>=3.1.0",
-  "sphinx-rtd-theme>=3.0.2",
+  "sphinx",
+  "sphinx-autodoc-typehints",
+  "sphinx-rtd-theme",
 ]
 
 [tool.ruff]