Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in debian/watch. (debian-watch-uses-insecure-uri)
• debian/rules: Use dh_prep rather than "dh_clean -k". (dh-clean-k-is-deprecated)
• Bump debhelper from old 10 to 12. (package-uses-old-debhelper-compat-version)
• Set upstream metadata fields: Repository, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-repository)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/lshw/c1aafffd-8528-4818-bbf6-68cd2d287945.

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/4b/85b20d69d04b1701a8879242db790439773a18.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/a0/46c94aafb672efbc02b12dfd46d569ee836b20.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/0e/f1efd08ef933b5d898fcb4702ac2878b4d1a40.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/a5/e5a94c0a7e5eb2bd4ac4070c08006c79dcd791.debug

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

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

• Build-Ids: a5e5a94c0a7e5eb2bd4ac4070c08006c79dcd791 a046c94aafb672efbc02b12dfd46d569ee836b20

No differences were encountered between the control files of package **lshw-gtk**

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

• Build-Ids: 0ef1efd08ef933b5d898fcb4702ac2878b4d1a40 4b85b20d69d04b1701a8879242db790439773a18

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