Fix stratisd FTBFS after Rust update to 1.90.0

To see if the problem is fixed, we can do a scratch build to see if it works.
Also, we should look for --cap-lints=warn show up in the RUSTFLAGS environment variable value in this build log. Here is the an example:

+ cd stratisd-stratisd-v3.7.3
+ /usr/bin/env CARGO_HOME=.cargo 'RUSTFLAGS=-Copt-level=3 -Cdebuginfo=2 -Ccodegen-units=1 -Cstrip=none --cap-lints=warn' /usr/bin/cargo build -j40 --release --bin=stratisd
Compiling proc-macro2 v1.0.87