Update dependency gitlab-com/gl-infra/common-ci-tasks to v2.21.0

This MR contains the following updates:

Package	Type	Update	Change
gitlab-com/gl-infra/common-ci-tasks	repository	minor	v2.20.4 -> v2.21.0

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Release Notes

gitlab-com/gl-infra/common-ci-tasks (gitlab-com/gl-infra/common-ci-tasks)

v2.21.0

Compare Source

2.21.0 (2024-07-18)

Features

• add Danger task (4198c6d)

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Configuration

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