Update cargo-msrv command to use find subcommand

Switches to the `find` subcommand in the cargo-msrv command to ensure
accurate verification of the minimum supported Rust version (MSRV).
This change improves the reliability of the MSRV detection process.

More info on the breaking change:
https://github.com/foresterre/cargo-msrv/releases/tag/v0.16.0

action.yml

@@ -59,7 +59,7 @@ runs:
         for path in "${paths[@]}"; do
           echo "Running cargo-msrv for $path"
           rm -f logs
-          cargo msrv --path $path --output-format json --no-log > logs
+          cargo msrv find --path $path --output-format json --no-log > logs
           version=$(cat logs | grep "msrv-complete" | jq -r '.msrv')
           if [[ "$version" == "null" ]]; then
             echo "Could not find MSRV for $path"