Help: Add release notes for topic 'cpack-deb-compression-types'

Help/release/dev/cpack-deb-compression-types.rst

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+cpack-deb-compression-types
+---------------------------
+
+* The :module:`CPackDeb` module learned a new
+  :variable:`CPACK_DEBIAN_COMPRESSION_TYPE` variable to set the
+  tarball compression type.