Github - Please make sure you have the correct access rights and the repository exists

[Vapiano]

Describe the bug
Following the install guide https://docs.filecoin.io/get-started/lotus/installation/#build-and-install-lotus
step "make clean all" fails to GitHub access

To Reproduce
Steps to reproduce the behavior:

1. Run 'make clean all'

2. pino@miner:~/test/lotus$ make clean all
   rm -rf build/.filecoin-install build/.update-modules lotus lotus-miner lotus-worker lotus-shed lotus-gateway lotus-seed lotus-pond lotus-townhall lotus-fountain lotus-chainwatch lotus-bench lotus-stats lotus-pcr lotus-health lotus-wallet testground
   make -C extern/filecoin-ffi/ clean
   make[1]: Entering directory '/home/pino/test/lotus/extern/filecoin-ffi'
   make[1]: *** No rule to make target 'clean'. Stop.
   make[1]: Leaving directory '/home/pino/test/lotus/extern/filecoin-ffi'
   make: [Makefile:289: clean] Error 2 (ignored)
   git submodule update --init --recursive
   Submodule 'extern/blst' (git@github.com:supranational/blst.git) registered for path 'extern/blst'
   Submodule 'extern/filecoin-ffi' (https://github.com/filecoin-project/filecoin-ffi.git) registered for path 'extern/filecoin-ffi'
   Submodule 'extern/oni' (https://github.com/filecoin-project/oni) registered for path 'extern/oni'
   Submodule 'extern/serialization-vectors' (https://github.com/filecoin-project/serialization-vectors) registered for path 'extern/serialization-vectors'
   Submodule 'extern/test-vectors' (https://github.com/filecoin-project/test-vectors.git) registered for path 'extern/test-vectors'
   Cloning into '/home/pino/test/lotus/extern/blst'...
   The authenticity of host 'github.com (140.82.121.3)' can't be established.
   RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
   Are you sure you want to continue connecting (yes/no/[fingerprint])?

Press yes

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of 'git@github.com:supranational/blst.git' into submodule path '/home/pino/lotus/extern/blst' failed
Failed to clone 'extern/blst' a second time, aborting
make: *** [Makefile:48: build/.update-modules] Error 1

Expected behavior
To connect

Version (run lotus version):
~/test/lotus$ lotus version
ERROR: dial tcp 127.0.0.1:1234: connect: connection refused

but downloaded today

Tuesday, 03 Nov 2020 10:36 PM

Standard Time Zone: GMT/UTC + 01:00 hour

[jennijuju]

This is fixed in #4713