Update build OSes, pre-install Python (#4762) #321

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10 errors

RPC failed; curl 56 OpenSSL SSL_read: Connection reset by peer, errno 104

15493 bytes of body are still expected

early EOF

fetch-pack: invalid index-pack output

RPC failed; curl 56 OpenSSL SSL_read: Connection reset by peer, errno 104

5466 bytes of body are still expected

early EOF

fetch-pack: invalid index-pack output

RPC failed; curl 56 OpenSSL SSL_read: error:0A000126:SSL routines::unexpected eof while reading, errno 0

6579 bytes of body are still expected