Drop support for Python 3.6 (EOL).

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python: ['3.6', '3.7', '3.8', '3.9', '3.10', 'pypy3']
+        python: ['3.7', '3.8', '3.9', '3.10', 'pypy3']
         architecture: [x86, x64]
         exclude:
           - os: ubuntu-latest
@@ -18,12 +18,8 @@ jobs:
             architecture: x86
           - os: windows-latest
             python: pypy3
-          - os: windows-latest
-            python: '3.6'
           - os: macos-latest
             python: pypy3
-          - os: macos-latest
-            python: '3.6'
 
     name: ${{ matrix.os }} Py ${{ matrix.python }} ${{ matrix.architecture }}
     steps:
@@ -41,7 +37,7 @@ jobs:
           poetry update
 
       - name: Run pre-commit
-        if: "!startsWith(matrix.python, 'pypy') && matrix.python != '3.6'"
+        if: "!startsWith(matrix.python, 'pypy')"
         run: |
           python -m pip install pre-commit
           pre-commit run --all-files

pyproject.toml

@@ -29,9 +29,8 @@ include = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.6"
+python = "^3.7"
 cryptography = ">=2.1, !=35, <39"
-dataclasses = {version = "^0.8", python = "<3.7"}
 pyscard = {version = "^1.9 || ^2.0.0", optional = true}
 
 [tool.poetry.extras]