Fix some issues reported by lintian

Fix some issues reported by lintian

• Use correct machine-readable copyright file URI. (out-of-date-copyright-format)
• Bump debhelper from old 9 to 10. (package-uses-old-debhelper-compat-version)
• Set upstream metadata fields: Archive, Bug-Database. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Update Vcs-* headers from vcswatch. (vcs-obsolete-in-debian-infrastructure)

This merge proposal was created automatically by the Janitor bot.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/fuzz/d0c2322e-0135-40f4-a6d4-b2b4a97099eb.

These changes have no impact on the binary debdiff.

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