Drop support for Python 3.6, part 1 (#8250)

* Document that typeshed support 3.7+.
* Don't run tests on Python 3.6.
* Remove Python 3.6 allow lists.
* Merge common allowlist items.

Part of #6189

.github/workflows/daily.yml

@@ -21,7 +21,7 @@ jobs:
       matrix:
         # macos-11 does not have tcl/tk installed, needed for stubtesting tkinter
         os: ["ubuntu-latest", "windows-latest", "macos-10.15"]
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11-dev"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11-dev"]
       fail-fast: false
 
     steps:
@@ -49,7 +49,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: "3.9"
       - name: Install dependencies
         run: pip install $(grep tomli== requirements-tests.txt) termcolor
       - name: Install apt packages

.github/workflows/stubtest_stdlib.yml

@@ -27,7 +27,7 @@ jobs:
       matrix:
         # macos-11 does not have tcl/tk installed, needed for stubtesting tkinter
         os: ["ubuntu-latest", "windows-latest", "macos-10.15"]
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11-dev"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11-dev"]
       fail-fast: false
 
     steps:

.github/workflows/tests.yml

@@ -66,7 +66,7 @@ jobs:
     strategy:
       matrix:
         platform: ["linux", "win32", "darwin"]
-        python-version: ["2.7", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["2.7", "3.7", "3.8", "3.9", "3.10", "3.11"]
       fail-fast: false
     steps:
       - uses: actions/checkout@v3
@@ -82,7 +82,7 @@ jobs:
     strategy:
       matrix:
         python-platform: ["Linux", "Windows", "Darwin"]
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
       fail-fast: false
     env:
       PYRIGHT_VERSION: 1.1.255 # Must match pyright_test.py.
@@ -112,7 +112,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: "3.9"
       - name: Install dependencies
         run: pip install $(grep tomli== requirements-tests.txt) termcolor
       - name: Run stubtest