Fix some issues reported by lintian

[debian-janitor]

Fix some issues reported by lintian

• Trim trailing whitespace. (file-contains-trailing-whitespace)
• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• debian/control: Add Vcs-Browser field (missing-vcs-browser-field)
• Bump debhelper from deprecated 8 to 12. (package-uses-deprecated-debhelper-compat-version)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Drop unnecessary dependency on dh-autoreconf. (useless-autoreconf-build-depends)
• Use canonical URL in Vcs-Git. (vcs-field-not-canonical)
• Fix day-of-week for changelog entries 0.62.1, 0.37-1. (debian-changelog-has-wrong-day-of-week)

This merge proposal was created automatically by the Janitor bot.

You can follow up to this merge proposal as you normally would.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/synaptic/c4ad0570-43fd-494f-a0ac-7316adf16055.

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 .changes but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/33/bdc2a4852ffd69a81c1b2a74fb6fa2243b631b.debug

Files in first .changes but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/5c/2be7ce82b9ce65356d408875dad7e759ea1326.debug

Control files of package synaptic: lines which differ (wdiff format)

• Homepage: [-http​://www.nongnu.org/synaptic/-] {+https​://www.nongnu.org/synaptic/+}

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

• Build-Ids: [-5c2be7ce82b9ce65356d408875dad7e759ea1326-] {+33bdc2a4852ffd69a81c1b2a74fb6fa2243b631b+}

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