chore: Drop EOL Python versions (3.7 & 3.8)

Author: di

.github/workflows/buildpack-integration-test.yml

@@ -14,28 +14,6 @@ on:
 permissions: read-all
 
 jobs:
-  python37:
-    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@main
-    with:
-      http-builder-source: 'tests/conformance'
-      http-builder-target: 'write_http_declarative'
-      cloudevent-builder-source: 'tests/conformance'
-      cloudevent-builder-target: 'write_cloud_event_declarative'
-      prerun: 'tests/conformance/prerun.sh ${{ github.sha }}'
-      builder-runtime: 'python37'
-      builder-runtime-version: '3.7'
-      start-delay: 5
-  python38:
-    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@main
-    with:
-      http-builder-source: 'tests/conformance'
-      http-builder-target: 'write_http_declarative'
-      cloudevent-builder-source: 'tests/conformance'
-      cloudevent-builder-target: 'write_cloud_event_declarative'
-      prerun: 'tests/conformance/prerun.sh ${{ github.sha }}'
-      builder-runtime: 'python38'
-      builder-runtime-version: '3.8'
-      start-delay: 5
   python39:
     uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@main
     with: