maint: bump earliest supported Python to 3.8

.github/workflows/pythonpackage.yml

@@ -111,7 +111,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10"]
+        python-version: [3.8, 3.9, "3.10"]
         install: [repo]
         include:
           - python-version: "3.10"
@@ -193,7 +193,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10"]
+        python-version: [3.8, 3.9, "3.10"]
         install: [repo]
         pip-flags: ['--pre']
 
@@ -253,9 +253,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Python 3.7
+    - name: Set up Python 3.8
       uses: actions/setup-python@v4
       with:
-        python-version: 3.7
+        python-version: 3.8
     - run: pip install flake8
     - run: flake8 niworkflows/

setup.cfg

@@ -6,7 +6,6 @@ classifiers =
     Intended Audience :: Science/Research
     Topic :: Scientific/Engineering :: Image Recognition
     License :: OSI Approved :: Apache Software License
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
@@ -24,7 +23,7 @@ project_urls =
 url = https://www.nipreps.org
 
 [options]
-python_requires = >= 3.7
+python_requires = >= 3.8
 install_requires =
     attrs
     jinja2