package/wireshark: security bump to version 3.2.8

package/wireshark: security bump to version 3.2.8

- Fix CVE-2020-26575: In Wireshark through 3.2.7, the Facebook Zero
  Protocol (aka FBZERO) dissector could enter an infinite loop. This was
  addressed in epan/dissectors/packet-fbzero.c by correcting the
  implementation of offset advancement.
  https://www.wireshark.org/security/wnpa-sec-2020-14.html
- Fix GQUIC dissector crash:
  https://www.wireshark.org/security/wnpa-sec-2020-15.html

https://www.wireshark.org/docs/relnotes/wireshark-3.2.8.html

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>