git: openjdk/jdk13u-dev: 8260356: (tz) Upgrade time-zone data to tzdata2021a

[Dmitry Cherepanov]

Changeset: fd2aac7e
Author:    Dmitry Cherepanov <dcherepanov at openjdk.org>
Date:      2021-03-04 15:41:26 +0000
URL:       https://git.openjdk.java.net/jdk13u-dev/commit/fd2aac7e

8260356: (tz) Upgrade time-zone data to tzdata2021a

Backport-of: d9aefa36ac1d4b711a3082e3ce6c442d4cb8e718

! make/data/tzdata/VERSION
! make/data/tzdata/africa
! make/data/tzdata/leapseconds