fix!: drop python 3.7 support

.github/workflows/docs-checker.yml

@@ -12,7 +12,7 @@ jobs:
       - name: 'Setup Environment'
         uses: actions/setup-python@v2
         with:
-          python-version: 3.6
+          python-version: 3.8
 
       - name: 'Clone repo'
         uses: actions/checkout@v2

.github/workflows/patch.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.8
 
       - name: Setup Node
         uses: actions/setup-node@v2

.github/workflows/server-tests-mariadb.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.8
 
       - name: Setup Node
         uses: actions/setup-node@v2

.github/workflows/server-tests-postgres.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.8
 
       - name: Setup Node
         uses: actions/setup-node@v2

.github/workflows/ui-tests.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.8
 
       - uses: actions/setup-node@v2
         with: