Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Update standards version to 4.5.0, no changes needed. (out-of-date-standards-version)

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/percona-toolkit/2326bcad-d8e4-4976-b7e7-2a72e2b281a9.

Debdiff

These changes affect the binary packages:

File lists identical (after any substitutions)

Control files: lines which differ (wdiff format)

• Homepage: http​://www.percona.com/software/percona-toolkit https​://www.percona.com/software/percona-toolkit

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