Bump bundled llhttp to 8.1.1 (#91)

Also drop Python 3.5/3.6 in CI/CD, however Python 3.5 is kept in setup.py

.github/workflows/release.yml

@@ -73,7 +73,6 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         cibw_arch: ["auto64", "aarch64", "universal2"]
         cibw_python:
-          - "cp36-*"
           - "cp37-*"
           - "cp38-*"
           - "cp39-*"
@@ -84,9 +83,6 @@ jobs:
             cibw_arch: universal2
           - os: macos-latest
             cibw_arch: aarch64
-          - os: macos-latest
-            cibw_python: "cp36-*"
-            cibw_arch: universal2
           - os: macos-latest
             cibw_python: "cp37-*"
             cibw_arch: universal2

.github/workflows/tests.yml

@@ -14,14 +14,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11.0-rc.2"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
         os: [windows-latest, ubuntu-latest, macos-latest]
-        exclude:
-          # Python 3.5 is unable to properly
-          # find the recent VS tooling
-          # https://bugs.python.org/issue30389
-          - os: windows-latest
-            python-version: 3.5
 
     env:
       PIP_DISABLE_PIP_VERSION_CHECK: 1