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)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Remove unnecessary get-orig-source-target. (debian-rules-contains-unnecessary-get-orig-source-target)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/myspell-pt-br/a93c5c9c-3455-4461-9e90-fe62e215fc91.

Debdiff

These changes affect the binary packages:

File lists identical (after any substitutions)

Control files of package aspell-pt-br: lines which differ (wdiff format)

• Homepage: [-http​://pt-br.libreoffice.org/projetos/projeto-vero-verificador-ortografico-] {+https​://pt-br.libreoffice.org/projetos/projeto-vero-verificador-ortografico+}

Control files of package myspell-pt-br: lines which differ (wdiff format)

• Homepage: [-http​://pt-br.libreoffice.org/projetos/projeto-vero-verificador-ortografico-] {+https​://pt-br.libreoffice.org/projetos/projeto-vero-verificador-ortografico+}

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