curl: Update to version 7.71.1

curl: Update to version 7.71.1

Several bugfixes and vulnerabilities has been fixed since the current available version 7.64.0 .

For a full overview, the changelog is located in here --> https://curl.haxx.se/changes.html,
a security problem overview in here --> https://curl.haxx.se/docs/security.html .

Signed-off-by: Erik Kapfer <ummeegge@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>