Bump cosmwasm-std to ^1.1.8

[webmaster128]

and remove those dependencies:

# We don't use the following dependencies directly. They're dependencies of our dependencies.
# We specify them to tighten their version requirements so that builds with `-Zminimal-versions` work.
# Once we bump `cosmwasm-*` deps to a version after `1.1.5`, we can remove these.
k256 = { version = "0.11.1", features = ["ecdsa"] }
anyhow = "1.0.41"

and

# We don't use the following dependencies directly. They're dependencies of our dependencies.
# We specify them to tighten their version requirements so that builds with `-Zminimal-versions` work.
# Once we bump `cosmwasm-*` deps to a version after `1.1.5`, we can remove these.
serde_json = "1.0.40"

[ueco-jb]

I recommend cargo-machete on all repositories. https://lib.rs/crates/cargo-machete
Maybe on CI even?