Relax upper bound on tls dependency

[mpilgrem]

The upper bound on the tls dependency can be relaxed.

Tested by building (stack test) with stack.yaml:

resolver: nightly-2024-10-23
extra-deps:
- tls-2.1.0

allow-newer: true

and

resolver: nightly-2024-10-23
extra-deps:
- tls-2.1.1

allow-newer: true

[jappeace]

thanks i'll release both mysql-haskell and keter in the afternoon, ping me if I forget

[mpilgrem]

@jappeace, pinging - as requested.

[jappeace]

done ✅