Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Repository. (upstream-metadata-missing-repository)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)

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/44/dfe42f1d76f164b281f889e6b45f80827e7531.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/5d/a816ba1168d319a7b573c3ef0c0111e144e6de.debug

No differences were encountered between the control files of package **stealth**

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

• Build-Ids: 5da816ba1168d319a7b573c3ef0c0111e144e6de 44dfe42f1d76f164b281f889e6b45f80827e7531

No differences were encountered between the control files of package **stealth-doc**

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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/stealth/231dae6a-fcb2-49ac-b156-ea336ddb1465.