Reduce test matrix

Author: patrick91

.github/workflows/e2e-cache.yml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['3.8', '3.9', 'pypy-3.7-v7.x']
+        python-version: ['3.9', 'pypy-3.7-v7.x']
     steps:
       - uses: actions/checkout@v2
       - name: Setup Python
@@ -39,7 +39,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['3.8', '3.9', 'pypy-3.7-v7.x']
+        python-version: ['3.9', 'pypy-3.7-v7.x']
     steps:
       - uses: actions/checkout@v2
       - name: Setup Python
@@ -59,7 +59,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['3.7', '3.8', '3.9', 'pypy-3.7-v7.3.5', 'pypy-3.7-v7.x']
+        python-version: ['3.9', 'pypy-3.7-v7.x']
     steps:
       - uses: actions/checkout@v2
       - name: Install poetry
@@ -79,7 +79,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['3.8', '3.9', 'pypy-3.7-v7.x']
+        python-version: ['3.9', 'pypy-3.7-v7.x']
     steps:
       - uses: actions/checkout@v2
       - name: Setup Python
@@ -98,7 +98,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['3.8', '3.9', 'pypy-3.7-v7.x']
+        python-version: ['3.9', 'pypy-3.7-v7.x']
     steps:
       - uses: actions/checkout@v2
       - name: Setup Python