Adds Cython wheel for 3.8 and updates CI step for LFS

We need a wheel for Cython on Python3.8 as our CI is running
on Ubuntu Focal. I also updated the CI steps for more `git-lfs`
commands.

.circleci/config.yml

@@ -259,6 +259,8 @@ jobs:
             virtualenv -p python3 .venv
             source .venv/bin/activate
             pip install -r test-requirements.txt
+            git lfs fetch
+            git lfs checkout
             pip install --require-hashes --no-index --no-deps --no-cache-dir -r build-requirements.txt --find-links ./bootstrap/
             pytest -vvs tests/test_reproducible_wheels.py
 

bootstrap-sha256sums.txt

@@ -1,6 +1,7 @@
 3fe8fac398ae76f534dee92c0db01c2960e271094f8cd52aa9d24a633c244e59  build-0.3.0-py2.py3-none-any.whl
 0eb95b2c8d770d7c4c9b92c68c227c350bbf65f3ec83551ace9097c18cc15fdd  build-0.3.0.tar.gz
 8c9eec7e9de2a30861ca347d0a149cc1482de12fc765fa06c414930e8ce20d0a  Cython-0.29.22-cp37-cp37m-linux_x86_64.whl
+66ade3dd9b9ac2ae12bf482ecbc3758304433f63b994acd723cc361941723e71  Cython-0.29.22-cp38-cp38-linux_x86_64.whl
 df6b83c7a6d1d967ea89a2903e4a931377634a297459652e4551734c48195406  Cython-0.29.22.tar.gz
 a14d6cca50a51eff2c418fc3f8e887cd31a3233a6b465451fd57074e232d7c4c  flit_core-2.3.0-py2.py3-none-any.whl
 a50bcd8bf5785e3a7d95434244f30ba693e794c5204ac1ee908fc07c4acdbf80  flit_core-2.3.0.tar.gz

bootstrap-sha256sums.txt.asc

@@ -1,16 +1,16 @@
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build-requirements.txt

@@ -1,5 +1,5 @@
 build==0.3.0 --hash=sha256:3fe8fac398ae76f534dee92c0db01c2960e271094f8cd52aa9d24a633c244e59
-cython==0.29.22 --hash=sha256:8c9eec7e9de2a30861ca347d0a149cc1482de12fc765fa06c414930e8ce20d0a
+cython==0.29.22 --hash=sha256:8c9eec7e9de2a30861ca347d0a149cc1482de12fc765fa06c414930e8ce20d0a --hash=sha256:66ade3dd9b9ac2ae12bf482ecbc3758304433f63b994acd723cc361941723e71
 flit-core==2.3.0 --hash=sha256:a14d6cca50a51eff2c418fc3f8e887cd31a3233a6b465451fd57074e232d7c4c
 importlib-metadata==3.7.0 --hash=sha256:35fc3ab05e060b85739da17db4ce33e8532ce1010d892d178f85a211e080e1ff
 packaging==20.9 --hash=sha256:44698376bc57a48290dc82bfdc20d339684856b24d6b8c3760b284de4eebc498