firefox115: Update to 115.3.1

Changelog:
115.3.1
  * Security fix
Mozilla Foundation Security Advisory 2023-44
#CVE-2023-5217: Heap buffer overflow in libvpx

115.3.0
Fixed

  * Various security fixes and other quality improvements.

Mozilla Foundation Security Advisory 2023-42
#CVE-2023-5168: Out-of-bounds write in FilterNodeD2D1
#CVE-2023-5169: Out-of-bounds write in PathOps
#CVE-2023-5171: Use-after-free in Ion Compiler
#CVE-2023-5174: Double-free in process spawning on Windows
#CVE-2023-5176: Memory safety bugs fixed in Firefox 118, Firefox ESR 115.3, and
Thunderbird 115.3

(ryoon)