Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Bump debhelper from old 11 to 12. (package-uses-old-debhelper-compat-version)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/pd-creb/8076047a-5202-490d-a977-d05577f7cdfd.

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/24/df0f2389f3da4837a2ec87419013b86426b0fb.debug

Files in first .changes but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/d6/171f3d3743422f0070a8f7ed39904c7e437800.debug

Control files of package pd-creb: lines which differ (wdiff format)

• Homepage: [-http​://zwizwa.be/creb-] {+https​://zwizwa.be/creb+}

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

• Build-Ids: d6171f3d3743422f0070a8f7ed39904c7e437800 24df0f2389f3da4837a2ec87419013b86426b0fb

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