Revert "feat(mise): add kurtosis to the toolchain (#13729)" (#13751)

This reverts commit 66a67e0.

Seems to cause issues in CI, unclear why.
Reverting pending investigation

Author: sigma

mise.toml

@@ -10,7 +10,6 @@ yq = "4.44.5"
 shellcheck = "0.10.0"
 direnv = "2.35.0"
 just = "1.37.0"
-kurtosis = "1.4.3"
 
 # Cargo dependencies
 "cargo:just" = "1.37.0"
@@ -48,10 +47,6 @@ binary_signer = "1.0.4"
 forge = "ubi:foundry-rs/foundry[exe=forge]"
 cast = "ubi:foundry-rs/foundry[exe=cast]"
 anvil = "ubi:foundry-rs/foundry[exe=anvil]"
-# aqua backend is currently broken
-shellcheck = "ubi:koalaman/shellcheck"
-# custom asdf plugin for now
-kurtosis = "asdf:ethereum-optimism/asdf-kurtosis"
 
 [settings]
 experimental = true