package/intel-microcode: security bump to version 20210608

package/intel-microcode: security bump to version 20210608

Fixes the following security issues:

- CVE-2020-24489: A potential security vulnerability in some Intel®
  Virtualization Technology for Directed I/0 (VT-d) products may allow
  escalation of privilege.  Intel is releasing firmware updates to mitigate
  this potential vulnerability.
  https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00442.html

- CVE-2020-24511: Potential security vulnerabilities in some Intel®
  Processors may allow information disclosure.  Intel is releasing firmware
  updates to mitigate these potential vulnerabilities.
  https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00464.html

- CVE-2020-24513: A potential security vulnerability in some Intel Atom®
  Processors may allow information disclosure.  Intel is releasing firmware
  updates to mitigate this potential vulnerability.
  https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00465.html

For more details, see the release notes:
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20210608

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>