Update dependency jenkinsci/plugin-installation-manager-tool to v2.12.3

This MR contains the following updates:

Package	Type	Update	Change
jenkinsci/plugin-installation-manager-tool	ironbank-github	patch	2.12.1 -> 2.12.3

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Release Notes

jenkinsci/plugin-installation-manager-tool

v2.12.3

Compare Source

🐛 Bug fixes

• Fix latest and experimental URL resolution (#​405) @​cronik

v2.12.2

Compare Source

🐛 Bug fixes

• Adjust download url precedence (#​404) @​cronik

📦 Dependency updates

• Bump jenkins from 1.69 to 1.70 (#​403) @​dependabot
• Bump assertj-core from 3.21.0 to 3.22.0 (#​402) @​dependabot

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