bib: Update current year

Signed-off-by: Michalis Kokologiannakis <mixaskok@gmail.com>

biblio.bib

@@ -4,7 +4,7 @@
 \providecommand{\bibAppendixAuthor}{Supplementary material}
 \providecommand{\bibAnonymizedTitle}{Anonymized material for this submission.}
 \providecommand{\bibAnonymizedAuthor}{Anonymous author(s)}
-\providecommand{\bibCurrentYear}{2020}
+\providecommand{\bibCurrentYear}{2021}
 
 \newcommand{\bibABZ}[1]{ABZ #1}
 \newcommand{\bibACSD}[1]{ACSD #1}