Pin gotestsum to v1.12.3 for Go 1.23 compatibility

Philip Cunninghamrequested to merge
philipcunningham-pin-gotestsum into master

What does this MR do?

Pins gotestsum to v1.12.3 to resolve build failures caused by the latest gotestsum v1.13.0 requiring Go 1.24+. Multiple analyzer projects using Go 1.23 are experiencing CI failures when the template installs gotestsum@latest, including GitLab Advanced SAST. This pin maintains compatibility with existing analyzers while they complete their Go 1.24 migrations, after which this pin can be reverted to @latest.

Edited by Philip Cunningham

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