Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (file-contains-trailing-whitespace)
• Use secure copyright file specification URI. (insecure-copyright-format-uri)
• Use secure URI in debian/watch. (debian-watch-uses-insecure-uri)
• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Bump debhelper from deprecated 9 to 12. (package-uses-deprecated-debhelper-compat-version)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)

This merge proposal was created automatically by the Janitor bot.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/libcacard/3e441a74-43e6-45fb-abb1-3b376bc2cda7.

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/7d/b2d4d293f60f18f76b5ee71cbbefa7830356b1.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/00/90d6b6f84f36f9b5a3534ebd044c7030eed71a.debug

Control files of package libcacard-dev: lines which differ (wdiff format)

• Homepage: http​://cgit.freedesktop.org/spice/libcacard/ https​://cgit.freedesktop.org/spice/libcacard/

Control files of package libcacard0: lines which differ (wdiff format)

• Homepage: http​://cgit.freedesktop.org/spice/libcacard/ https​://cgit.freedesktop.org/spice/libcacard/

Control files of package libcacard0-dbgsym: lines which differ (wdiff format)

• Build-Ids: 0090d6b6f84f36f9b5a3534ebd044c7030eed71a 7db2d4d293f60f18f76b5ee71cbbefa7830356b1

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