openpgp: Relax unicode-normalization dependency.

  - The dependency for unicode-normalization was introduced in
    f07a1f4, with the goal (I think)
    of keeping a low MSRV.  In #413, @nwalfield pointed me to
    unicode-rs/unicode-normalization#50,
    with more background.

    This cleanup is by analogy with the cleanup in !535 -- we are
    trying to avoid a higher dependency, but there is no reason to pin
    to a specific version; our transitive dependencies can take care
    of setting the lower bound on the version.

Signed-off-by: Daniel Kahn Gillmor <[email protected]>

Author: dkg

openpgp/Cargo.toml

@@ -35,7 +35,7 @@ nettle = "6.0.1"
 quickcheck = { version = "0.9", default-features = false }
 rand = { version = "0.7", default-features = false }
 regex = "1"
-unicode-normalization = "=0.1.9"
+unicode-normalization = "< 0.1.10"
 
 [build-dependencies]
 lalrpop = "0.17"