frontend-build: critical security vulnerability needs ejs update (via webpack-bundle-analyzer)

[dianekaplan]

Critical: Template injection in ejs
Patched in ejs version >=3.1.7
dependency chain: @edx/frontend-build > webpack-bundle-analyzer > ejs
more info: GHSA-phwq-j96m-2c2q

It looks like frontend-build currently uses webpack-bundle-analyzer 3.9.0, which only uses ejs version 2.7.4. (We need to update webpack-bundle-analyzer to a version that uses ejs >=3.1.7).

[arbrandes]

Done via another dependency upgrade PR.

[pshiu]

This was done via openedx/frontend-build#248