Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Repository-Browse. (upstream-metadata-file-is-missing)
• 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 (out-of-date-standards-version)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/36/d0f8afc86563c35f810b33bdec89f5ce341c58.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/64/1801218945bb5a014995e2479f1df4693c4867.debug

No differences were encountered between the control files of package **sac2mseed**

Control files of package sac2mseed-dbgsym: lines which differ (wdiff format)

• Build-Ids: 641801218945bb5a014995e2479f1df4693c4867 36d0f8afc86563c35f810b33bdec89f5ce341c58

You can also view the diffoscope diff (unfiltered).

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/sac2mseed/5e9817d5-930f-4921-bdb2-b64f7573d84f.