Revert "snap: Change confinement from strict to classic"
Revert "snap: Change confinement from strict to classic"

We need to wait until classic confinement review process at
https://forum.snapcraft.io/t/request-for-classic-confinement-for-hugo-snap/19892
is completed before "confinement: classic" uploads to the Snap Store
are accepted.

This reverts commit 6f4ff1a4617ec42861d255db718286ceaf4f6c8e.

gohugoio/hugo,gohugoio/hugo,anthonyfok/hugo,anthonyfok/hugo,gohugoio/hugo,anthonyfok/hugo