Upstream in in commit 706f0e395f53 ("include/download.mk: switch to zst
compression") changed default source code tarball compression method to
.zst, thus it changes the resulting source code package checksum.
So lets fix it by providing the expected hash.
References: PCF-1604
References: 706f0e395f
Signed-off-by: Petr Štetiar <petr.stetiar@prplfoundation.org>