Prepare for release v.1.48.0 #6018

Job	Run time
libssh2	3m 25s
Python main	5m 18s
libevent	29m 55s
Python releases (FIPS=0 OPENSSL_IN_CRT=0)	13m 25s
Ruby main	2m 27s
Ruby releases (FIPS=0)	13m 49s
Python releases (FIPS=1 OPENSSL_IN_CRT=0)	15m 11s
Ruby releases (FIPS=1)	15m 28s
Python releases (FIPS=0 OPENSSL_IN_CRT=1)	12m 44s
Python releases (FIPS=1 OPENSSL_IN_CRT=1)	12m 23s
	2h 4m 5s

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