Security update for chromium
This update for chromium fixes the following issues:
- Update to 84.0.4147.135 (boo#1175505):
* CVE-2020-6556: Heap buffer overflow in SwiftShader
- Submitted by Tomáš Chvátal (scarabeus_iv)
Fixed bugs
bnc#1175505
VUL-0: chromium: update to 84.0.4147.135