chore(deps): update dependency https://gitlab.com/gitlab-com/gl-infra/common-template-copier.git to v1.21.0

This MR contains the following updates:

Package	Type	Update	Change
https://gitlab.com/gitlab-com/gl-infra/common-template-copier.git	template	minor	v1.20.3 -> v1.21.0

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Release Notes

gitlab-com/gl-infra/common-template-copier (https://gitlab.com/gitlab-com/gl-infra/common-template-copier.git)

v1.21.0

Compare Source

1.21.0 (2024-09-06)

Features

• enable .envrc.personal (86e2c67)

Bug Fixes

• gitignore spacing (a201005)
• incorrect shell reference in migration script (b86b47f)

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