Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Bump debhelper from old 11 to 13. (package-uses-old-debhelper-compat-version)
• Set upstream metadata fields: Archive, Contact, Name. (upstream-metadata-file-is-missing)
• Update lintian override info format in d/r-cran-nnet.lintian-overrides on line 1. (mismatched-override)
• 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 (out-of-date-standards-version)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/e0/e79d4207e01595f0a968e73828e4572600d83f.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/97/d29082260a45f074283be1f2602cca178d4804.debug

Control files of package r-cran-nnet: lines which differ (wdiff format)

• Depends: r-base-core (>= 4.2.1-2), 4.2.2.20221110-2), r-api-4.0, libc6 (>= 2.4)

Control files of package r-cran-nnet-dbgsym: lines which differ (wdiff format)

• Build-Ids: 97d29082260a45f074283be1f2602cca178d4804 e0e79d4207e01595f0a968e73828e4572600d83f

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Build and test logs for this branch can be found at https://janitor.debian.net/run/720a1434-c740-4c28-baba-52851036533c.