chore: bump min python version to 3.10 (#2237)

Author: wpbonelli

.github/workflows/compilers.yml

@@ -202,7 +202,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: '3.10'
 
       - name: Install packages
         run: pip install tabulate pandas

DEVELOPER.md

@@ -72,7 +72,7 @@ To build and test an extended version of the program, first read the instruction
 Before you can build and test MODFLOW 6, you must install and configure the following on your development machine:
 
 - git
-- Python3.9+
+- Python3.10+
 - a modern Fortran compiler
 
 Some additional, optional tools are also discussed below.
@@ -90,7 +90,7 @@ git config blame.ignoreRevsFile .git-blame-ignore-revs
 
 ### Python
 
-Python 3.9+ is required to run MODFLOW 6 tests and in some cases to build MODFLOW 6. Information on installing the python environment is given in the [Installing Python environment](#install-the-python-environment) section. The MODFLOW 6 python environment should be installed after [locally cloning the repository](#get-the-modflow-6-repository).
+Python 3.10+ is required to run MODFLOW 6 tests and in some cases to build MODFLOW 6. Information on installing the python environment is given in the [Installing Python environment](#install-the-python-environment) section. The MODFLOW 6 python environment should be installed after [locally cloning the repository](#get-the-modflow-6-repository).
 
 ### Fortran compiler
 
@@ -237,7 +237,7 @@ git remote add upstream https://github.com/MODFLOW-ORG/modflow6.git
 
 ## Install the python environment
 
-Python 3.9+ is required to run MODFLOW 6 tests and in some cases to build MODFLOW 6. Miniforge is the recommended python distribution if you do not have an existing Conda or Mamba based python distribution.
+Python 3.10+ is required to run MODFLOW 6 tests and in some cases to build MODFLOW 6. Miniforge is the recommended python distribution if you do not have an existing Conda or Mamba based python distribution.
 
 The [environment file for MODFLOW 6](./environment.yml) includes all of the required [python dependencies](#python-dependencies). Install the `modflow6` environment using the Conda `environment.yml` file in the repository. 
 

environment.yml

@@ -5,7 +5,7 @@ channels:
   - nodefaults
 
 dependencies:
-  - python>=3.9
+  - python>=3.10
   - appdirs
   - cffconvert
   - codespell