fix: replace deprecated Docker Hub registry FQDN

mentioned in commit f327b114

mentioned in merge request euri10/htmx-examples-litestar!21

mentioned in merge request euri10/yatg!91

mentioned in merge request vriska/searchdown!35

mentioned in merge request to-be-continuous/tools/gitlab-ci-test!2

mentioned in merge request hobyte/pergament!71 (closed)

mentioned in merge request to-be-continuous/tools/gitlab-ci-test!7

mentioned in merge request hobyte/pergament!73

mentioned in merge request to-be-continuous/tools/gitlab-ci-test!8