Drop Python 3.7

The Python 3.7 End of Support is coming 2023-06-27, and various upstream
tools, including from this project's perspective `case-utils`, have
consequently dropped support for that Python version.

References:
* casework/CASE-Utilities-Python#99
* https://www.python.org/downloads/

Signed-off-by: Alex Nelson <[email protected]>

Author: ajnelson-nist

.github/workflows/python-package.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v3

setup.cfg

@@ -18,7 +18,7 @@ install_requires =
     Pillow
     rdflib
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.8
 scripts =
     pillow_case/exif_node_maker.py