ci: remove dry-run, enabling release CI jobs

Related Issue: #109 (closed)

This MR re-enables the release-v1 and release-v2 CI jobs by removing their dry-run flag.

These jobs were disabled due to #109 (closed), which has now been resolved; the release script is fixed (!478 (merged)) and all accidentally deleted tags have been restored:

> GOPROXY=direct go list -m -versions gitlab.com/gitlab-org/labkit/v2
gitlab.com/gitlab-org/labkit/v2 v2.0.0 v2.1.0 v2.1.1 v2.1.2 v2.2.0 v2.2.1 v2.2.2 v2.3.0 v2.3.1 v2.4.0 v2.4.1 v2.5.0