Fix arbitrary to 1.4.1 and add Cargo.lock

`arbitrary-v1.4.2` includes a module `details` behind the `derive`
feature flag. The various `alloy` crates depend directly on
`derive_arbitrary` and do not use the `derive` feature flag of
arbitrary. As a result, the `details` module in `arbitrary` will not be
visible, causing compilation errors.

To work around this, we add the `Cargo.lock` file with version 1.4.1 of
`arbitrary` and `derive_arbitary`.

Author: twittner

.gitignore

@@ -3,10 +3,6 @@
 debug/
 target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
 # Exclude sources generated by protoc.
 timeboost-proto/src/*.rs