Drop Python 3.6 config from CI wheels.

This was only enabled on the v3.3.x branch, so can be dropped from 3.5,
and even 3.4 (but not going to bother).

Author: QuLogic

.github/workflows/cibuildwheel.yml

@@ -57,7 +57,7 @@ jobs:
           cd numpy-${{ env.min-numpy-version }}
           python -m cibuildwheel --output-dir ../numpy-aarch64-cache
         env:
-          CIBW_BUILD: "cp36-* cp37-* cp38-*"
+          CIBW_BUILD: "cp37-* cp38-*"
           CIBW_ARCHS: aarch64
 
       - name: Copy setup.cfg to configure wheel
@@ -86,20 +86,6 @@ jobs:
           MPL_DISABLE_FH4: "yes"
           CIBW_ARCHS: ${{ matrix.cibw_archs }}
 
-      - name: Build wheels for CPython 3.6
-        run: |
-          python -m cibuildwheel --output-dir dist
-        env:
-          CIBW_BUILD: "cp36-*"
-          CIBW_MANYLINUX_X86_64_IMAGE: manylinux1
-          CIBW_MANYLINUX_I686_IMAGE: manylinux1
-          CIBW_BEFORE_BUILD: pip install certifi; pip install --find-links=numpy-aarch64-cache/ numpy==${{ env.min-numpy-version }}
-          MPL_DISABLE_FH4: "yes"
-          CIBW_ARCHS: ${{ matrix.cibw_archs }}
-        if: >
-          startsWith(github.ref, 'refs/heads/v3.3') ||
-          startsWith(github.ref, 'refs/tags/v3.3')
-
       - name: Build wheels for PyPy
         run: |
           python -m cibuildwheel --output-dir dist

.github/workflows/circleci.yml

@@ -9,4 +9,4 @@ jobs:
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           artifact-path: 0/doc/build/html/index.html
-          circleci-jobs: docs-python36,docs-python37,docs-python38
+          circleci-jobs: docs-python37,docs-python38,docs-python38-min