fix: upgrade typeorm from 0.3.20 to 0.3.21 (#569)

Snyk has created this PR to upgrade typeorm from 0.3.20 to 0.3.21.

See this package in npm:
typeorm

See this project in Snyk:
https://app.snyk.io/org/lupu60/project/3d45939a-deb7-422d-9780-c1b48d686104?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: lupu60