Drop support for Python 3.7

Following the policy outlined in:

https://aws.amazon.com/blogs/developer/python-support-policy-updates-for-aws-sdks-and-tools/

The PSF dropped support for Python 3.7 June 2023, and the AWS SDKs
dropped support for Python 3.7 December 2023.  You can also no longer
create or update Lambda functions on Python 3.7.

.github/workflows/run-tests.yml

@@ -29,31 +29,11 @@ jobs:
           make install-dev-deps
       - name: Run PRCheck
         run: make prcheck
-  testsonly:
-    runs-on: ${{ matrix.os }}
-    env:
-      HYPOTHESIS_PROFILE: ci
-      CHALICE_TEST_EXTENDED_PACKAGING: true
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
-        python-version: [3.7]
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
-        name: Set up Python ${{ matrix.python-version }}
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Install dependencies
-        run: |
-          pip install -r requirements-test.txt --upgrade --upgrade-strategy eager -e .
-      - name: Run Tests
-        run: make coverage
   cdktests:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, '3.10', 3.11]
+        python-version: [3.8, 3.9, '3.10', 3.11]
         cdk-version: [cdk, cdkv2]
     steps:
       - uses: actions/checkout@v2

chalice/config.py

@@ -148,16 +148,18 @@ def lambda_python_version(self) -> str:
         # we attempt to match your python version to the closest version
         # supported by lambda.
         major, minor = sys.version_info[0], sys.version_info[1]
-        if major == 2:
-            return 'python2.7'
-        # Python 3 for backwards compatibility needs to select python3.6
-        # for python versions 3.0-3.6. 3.7-3.10 will use their version.
-        # 3.11 and higher will use 3.11
-        elif (major, minor) <= (3, 6):
-            return 'python3.6'
-        elif (major, minor) <= (3, 10):
+        # We default to the minimum version supported by Lambda if you're
+        # using an version no longer supported by Lambda.
+        if (major, minor) < (3, 8):
+            return 'python3.8'
+        elif (major, minor) <= (3, 12):
+            # Otherwise we use your current version of python if Lambda
+            # supports it.
             return 'python%s.%s' % (major, minor)
-        return 'python3.11'
+        else:
+            # Otherwise if you're using a new version than what's supported
+            # by Lambda we default to the latest version Lambda supports.
+            return 'python3.11'
 
     @property
     def log_retention_in_days(self) -> int:

chalice/deploy/packager.py

@@ -76,9 +76,6 @@ class BaseLambdaDeploymentPackager(object):
     _VENDOR_DIR = 'vendor'
 
     _RUNTIME_TO_ABI = {
-        'python2.7': 'cp27mu',
-        'python3.6': 'cp36m',
-        'python3.7': 'cp37m',
         'python3.8': 'cp38',
         'python3.9': 'cp39',
         'python3.10': 'cp310',