Update registry.gitlab.com/gitlab-ci-utils/container-images/image-tools Docker tag to v1.7.3

This MR contains the following updates:

Package	Type	Update	Change
registry.gitlab.com/gitlab-ci-utils/container-images/image-tools	image	patch	1.7.1 -> 1.7.3

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Release Notes

gitlab-ci-utils/container-images/image-tools (registry.gitlab.com/gitlab-ci-utils/container-images/image-tools)

v1.7.3

Compare Source

Fixed

• Updated to regctl v0.9.2. See the release notes for details.

Miscellaneous

• Updated to GitLab CI Templates to v44.2.0. See the release notes for details.

v1.7.2

Compare Source

Fixed

• Updated to regctl v0.9.1. See the release notes for details.

Miscellaneous

• Updated to GitLab CI Templates to v44.1.0. See the release notes for details.
• Updated to Renovate config presets v3.0.1. See the release notes for details.

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