[Core] - Update the UPGRADE.md document for the release of 1.4

[Core] - Update the UPGRADE.md document for the release of 1.4

changed milestone to %FusionDirectory 1.4

added PJ1802-0188 release labels

assigned to @tdockx

By dockx thibault on 2023-05-02T14:43:33 (imported from GitLab)

cloned to fd-plugins#6229 (closed)

By dockx thibault on 2023-05-02T14:43:50 (imported from GitLab)

created branch 6277-core-update-the-upgrade-md-document-for-the-release-of-1-4 to address this issue

By dockx thibault on 2023-05-02T14:44:14 (imported from GitLab)

mentioned in merge request !1040

By dockx thibault on 2023-05-02T14:44:32 (imported from GitLab)

mentioned in commit b7605730

By dockx thibault on 2023-05-02T15:05:43 (imported from GitLab)

closed