Update the affiliation of Zaoxing Liu from BU to UMD (#6304)

Zaoxing Liu joined the CS department at University of Maryland - College Park.

csrankings-z.csv

@@ -17,7 +17,7 @@ Zahir Tari,RMIT University,https://www.rmit.edu.au/contact/staff-contacts/academ
 Zak Kincaid,Princeton University,http://www.cs.princeton.edu/~zkincaid,uT9We9MAAAAJ
 Zakir Durumeric,Stanford University,https://zakird.com,TxPSRHIAAAAJ
 Zanoni Dias,UNICAMP,http://www.escience.org.br/zanoni.dias,DI_Wyj0AAAAJ
-Zaoxing Liu,Boston University,https://www.bu.edu/eng/profile/alan-liu,qvK1_5wAAAAJ
+Zaoxing Liu,University of Maryland - College Park,https://www.cs.umd.edu/~zaoxing,qvK1_5wAAAAJ
 Zbigniew Michalewicz,University of Adelaide,https://cs.adelaide.edu.au/~zbyszek,tl_762kAAAAJ
 Zbigniew Stachniak,York University,http://www.cse.yorku.ca/~zbigniew,NOSCHOLARPAGE
 Zbigniew W. Ras,UNC - Charlotte,https://webpages.uncc.edu/ras,2ihGAJkAAAAJ