Check the result of the build test with stable version of Rust

[fukai-t]

As mentioned #15 (comment), this monthly test will fail until the stable release of rust 1.88 (on 2025/06/26).

The following is the list of expected result of the monthly build test. We will check these results.

• on 2025/05/01... fail
• on 2025/06/01 ... fail
• on 2025/07/01 and after ... success <-- when we confirm this result, we will close this issue.

[fukai-t]

Expected result: https://github.com/RIKEN-RCCS/MilvusVisor/actions/runs/14768222713

[PG-MANA]

It worked fine: https://github.com/RIKEN-RCCS/MilvusVisor/actions/runs/15988246241
Therefore, we will close this issue.