Discontinue python 3.9; update sliderule

Author: kzalite

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ["3.9", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4

README.md

@@ -30,7 +30,7 @@ cd HydroEO
 uv sync
 ```
 #### Python versions
-HydroEO currently runs on Python 3.9 - 3.12.
+HydroEO currently runs on Python 3.10 - 3.12.
 
 ## Quick start
 A single unified configuration template covers all four use cases: [notebooks/example_config.yaml](./notebooks/example_config.yaml).
@@ -491,7 +491,7 @@ export HYDROWEB_API_KEY="your_hydroweb_api_key"
 **Automated checks** run on every push and pull request via GitHub Actions (see [.github/workflows/ci.yml](.github/workflows/ci.yml)):
 
 1. **Lint** (ruff) — checks code style and imports
-2. **Unit tests** — runs on Ubuntu and Windows, Python 3.9 and 3.12; publishes coverage to Codecov
+2. **Unit tests** — runs on Ubuntu and Windows, Python 3.10 and 3.12; publishes coverage to Codecov
 3. **Integration tests** — runs live API calls (only on official repo when enabled)
 
 **For repo maintainers:** To enable live integration tests, set these GitHub secrets and variables:

pyproject.toml

@@ -32,7 +32,7 @@ dependencies = [
     "scikit-learn>=1.4.0,<2.0",
     "scipy>=1.11.0,<2.0",
     "py-hydroweb>=1.0.2,<2.0",
-    "sliderule>=5.3.0,<5.4",
+    "sliderule>=5.4.0",
     "xarray>=2024.0.0,<2025.0",
     "rasterio>=1.3.0,<2.0",
     "rioxarray>=0.13.0,<1.0",
@@ -44,12 +44,11 @@ authors = [
 ]
 description = "Easy access altimetry for water resource applications"
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = {file = "LICENSE"}
 keywords = ["altimetry", "hydrology", "satellite", "SWOT", "Sentinel", "ICESat-2", "water-resources", "earth-observation"]
 classifiers = [
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -111,9 +110,3 @@ markers = [
 [tool.ruff]
 # ignore long lines
 lint.ignore = ["E501"]
-
-[tool.mypy]
-python_version = "3.9"
-ignore_missing_imports = true
-warn_unreachable = false
-no_implicit_optional = true