Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Use secure copyright file specification URI. (insecure-copyright-format-uri)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Re-export upstream signing key without extra signatures. (public-upstream-key-not-minimal)
• Update standards version to 4.6.1, 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 (out-of-date-standards-version)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/0e/622a5b72423e3a395dbba3514b3a822386361e.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/21/51a2e30d6a2c2110707dfa3022f43ded12b257.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/5c/125ee83aada97a68b68f6333e1c109b1a23782.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/23/948216c88b4102d3f1d227f0b10fdd9c1294df.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/78/5e28a552b7195f284541fc09c134a88b71fcbe.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/ff/350abfabab2ca3134159666951bcaff030eeca.debug

Control files of package bro-aux: lines which differ (wdiff format)

• Depends: libc6 (>= 2.4), 2.34), libpcap0.8 (>= 0.9.8)

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

• Build-Ids: 23948216c88b4102d3f1d227f0b10fdd9c1294df 785e28a552b7195f284541fc09c134a88b71fcbe ff350abfabab2ca3134159666951bcaff030eeca 0e622a5b72423e3a395dbba3514b3a822386361e 2151a2e30d6a2c2110707dfa3022f43ded12b257 5c125ee83aada97a68b68f6333e1c109b1a23782

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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/zeek-aux/14ade184-8a08-486c-9339-fd8bc7f66da1.