koa-ejs Depends on vulnerable versions of ejs

Please update ejs dependency to ^3.1.10

ejs <=3.1.9
Severity: critical
ejs template injection vulnerability - https://github.com/advisories/GHSA-phwq-j96m-2c2q
ejs lacks certain pollution protection - https://github.com/advisories/GHSA-ghr5-ch3p-vcr6

Locate the ejs dependency declaration in the repository and check how the resolved version is recorded. Update it to ^3.1.10, then run the existing test suite; done means the vulnerable version is no longer resolved and the tests pass.

Written by the indexing model from the issue text.