lens-5.3 not accepted

[ysangkok]

while the git source has no version bound for lens, the uploaded version does, so e.g. v0.2.7.1 on hackage doesn't accept lens-5.3. it would be nice if it did, since we could then bump the library on stackage, see

• lens-5.3 commercialhaskell/stackage#7408

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