package/libcurl: bump to version 7.64.1
Contains a number of fixes for issues discovered post-7.64.0. For details,
see the list of changes:
https://curl.haxx.se/changes.html#7_64_1
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>