Bump activesupport to 6.1
Relates to !3395
Blocks #3446
Blocked by gitlab-org/gitlab#331149
Also fixes 3 vulnerabilities (in actionpack gem): https://gitlab.com/gitlab-org/gitaly/-/security/vulnerabilities/8813673 https://gitlab.com/gitlab-org/gitaly/-/security/vulnerabilities/8813674 https://gitlab.com/gitlab-org/gitaly/-/security/vulnerabilities/8813675
- CVE-2021-22885, CVE-2021-22902, CVE-2021-22904
issue