Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure copyright file specification URI. (insecure-copyright-format-uri)

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)

• Bump debhelper from old 11 to 13. (package-uses-old-debhelper-compat-version)

• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/clojure/f9451d01-c14f-478e-aa37-e195c6af7b5e.

Debdiff

These changes affect the binary packages:

File lists identical (after any substitutions)

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

• Homepage: http​://clojure.org https​://clojure.org

Control files of package libclojure-java: lines which differ (wdiff format)

• Homepage: http​://clojure.org https​://clojure.org

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