Disable cargo audit, not going to cherry-pick audit fixes into v0.19

ci/test-checks.sh

@@ -18,8 +18,6 @@ _ cargo +"$rust_stable" clippy --version
 _ cargo +"$rust_stable" clippy --all --exclude solana-sdk-c -- --deny=warnings
 _ cargo +"$rust_stable" clippy --manifest-path sdk-c/Cargo.toml -- --deny=warnings
 
-_ cargo +"$rust_stable" audit --version
-_ cargo +"$rust_stable" audit --ignore RUSTSEC-2019-0013
 _ ci/nits.sh
 _ ci/order-crates-for-publishing.py
 _ book/build.sh
@@ -27,7 +25,6 @@ _ book/build-svg.sh
 
 {
   cd programs/bpf
-  _ cargo +"$rust_stable" audit
   for project in rust/*/ ; do
     echo "+++ do_bpf_checks $project"
     (