docs: shift image to latest 20.04 (#6331)

openssl version is messed in `image 7', which causes error e.g.
https://readthedocs.org/projects/cryptography/builds/14446988/

Signed-off-by: Match Man <ppucoder@gmail.com>
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match man 2021-09-30 01:32:29 +03:00 committed by GitHub
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@ -6,6 +6,8 @@ sphinx:
builder: dirhtml
build:
# First RTD build env which includes a rust toolchain
image: "7.0"
# readdocs master now includes a rust toolchain
os: "ubuntu-20.04"
tools:
python: "3.9"