net/py-speedtest-cli: update to 2.1.3

v2.1.3 includes a runtime fix [1], without which the port is not usable,
hence it needs to be MFH'ed.

[1]: https://github.com/sivel/speedtest-cli/pull/769

Changes: https://github.com/sivel/speedtest-cli/releases/tag/v2.1.3

PR: 254906, 256181
MFH Approved by: lwhsu (mentor), portmgr (blanket, runtime fix)

(cherry picked from commit ee9e5cfd9328ecd7cc0aec2db0c0e8c086ade442)