Fix some issues reported by lintian

Fix some issues reported by lintian

• Update lintian override info format in d/sweeper.lintian-overrides on line 2. (mismatched-override)
• 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 (out-of-date-standards-version)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/sweeper/4449c508-e837-4a10-a749-e39c3dd7f7cc.

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/b3/5048669035e3e2ed8bc25622e31b02d4dca6e3.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/16/00605025ac91592f82dfa6af731c1d2c1e9fca.debug

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

• Depends: kio, libc6 (>= 2.14), 2.34), libkf5activitiesstats1 (>= 5.83.0~), libkf5bookmarks5 (>= 5.83.0~), libkf5configcore5 (>= 5.83.0~), libkf5configwidgets5 (>= 5.83.0~), libkf5coreaddons5 (>= 5.83.0~), libkf5crash5 (>= 5.83.0~), libkf5i18n5 (>= 5.83.0~), libkf5kiocore5 (>= 5.83.0~), libkf5textwidgets5 (>= 5.83.0~), libkf5widgetsaddons5 (>= 4.96.0), libkf5xmlgui5 (>= 5.83.0~), libqt5core5a (>= 5.15.1), libqt5dbus5 (>= 5.15.0~), libqt5gui5 (>= 5.15.0~) | libqt5gui5-gles (>= 5.15.0~), libqt5widgets5 (>= 5.15.0~), libqt5xml5 (>= 5.15.0~), libstdc++6 (>= 4.1.1)

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

• Build-Ids: 1600605025ac91592f82dfa6af731c1d2c1e9fca b35048669035e3e2ed8bc25622e31b02d4dca6e3

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