Update swh_loader_git to 20230530.2

This pulls a newer version of Dulwich (0.21.5) into the image, without
changes to swh-loader-git itself.

Requested in swh/infra/sysadm-environment#4888 to fix swh/devel/swh-loader-git#4749.

values-swh-application-versions.yaml

@@ -11,7 +11,7 @@ swh_loader_bzr_image_version: '20230503.1'
 swh_loader_cvs_image: container-registry.softwareheritage.org/swh/infra/swh-apps/loader_cvs
 swh_loader_cvs_image_version: '20230522.1'
 swh_loader_git_image: container-registry.softwareheritage.org/swh/infra/swh-apps/loader_git
-swh_loader_git_image_version: '20230502.1'
+swh_loader_git_image_version: '20230530.2'
 swh_loader_mercurial_image: container-registry.softwareheritage.org/swh/infra/swh-apps/loader_mercurial
 swh_loader_mercurial_image_version: '20230523.1'
 swh_loader_metadata_image: container-registry.softwareheritage.org/swh/infra/swh-apps/loader_metadata