Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Use secure copyright file specification URI. (insecure-copyright-format-uri)
• Bump debhelper from deprecated 8 to 10. (package-uses-deprecated-debhelper-compat-version)
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Use secure URI in Vcs control header Vcs-Git. (vcs-field-uses-insecure-uri)
• Update Vcs-* headers from URL redirect. (vcs-obsolete-in-debian-infrastructure)
• Use canonical URL in Vcs-Git. (vcs-field-not-canonical)

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/18/18c3cc9b653fd764b91b79cf1b865e3650d048.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/6b/ac9f6739420a3909a17d0309d61ca14681800e.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/2d/daa8f1234fadaa36242ecec0e7144afd7f6b79.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/8d/86f3ed86a0a5cd3f48918b0d18cf96cdb2f876.debug

No differences were encountered between the control files of package **lua-rings**

Control files of package lua-rings-dbgsym: lines which differ (wdiff format)

• Build-Ids: 2ddaa8f1234fadaa36242ecec0e7144afd7f6b79 8d86f3ed86a0a5cd3f48918b0d18cf96cdb2f876 1818c3cc9b653fd764b91b79cf1b865e3650d048 6bac9f6739420a3909a17d0309d61ca14681800e

No differences were encountered between the control files of package **lua-rings-dev**

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This merge proposal was created by the Janitor bot, and it will automatically rebase or close this proposal as appropriate when the target branch changes. Any comments you leave here will be read by the Janitor's maintainers.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/lua-rings/a421bee9-bfb5-4e97-a28f-87d62f195cdd.