Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/rpcsvc-proto/5452d974-848b-488e-9ab1-88e32c50d3bd.

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/b0/a13b2e5a0bdb12104cf474b1452508f44996e7.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/ba/165d4cb288afa86627f6f1f20388134aec0924.debug

Control files of package rpcsvc-proto: lines which differ (wdiff format)

• Depends: libc6 (>= 2.33) 2.34)

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

• Build-Ids: ba165d4cb288afa86627f6f1f20388134aec0924 b0a13b2e5a0bdb12104cf474b1452508f44996e7

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