Upgrade serde yaml

[atezet]

Changes

Upgrade serde_yaml to the newest released version (0.9). serde_yaml 0.8 depends on the unmaintained yaml-rust RUSTSEC-2024-0320, and an upgrade didn't seem to break anything. Point of discussion is that serde_yaml is now archived/deprecated entirely and will probably be marked as unmaintained in the near future as well https://github.com/rustsec/advisory-db/issues/1925.

Checklist

• [x] An issue to be fixed by this PR is listed above.
• [-] New tests are added to ensure new features are working. Please refer to this page to see how to add a test.
• [x] ./frb_internal precommit --mode slow (or fast) is run (it internal runs code generator, does auto formatting, etc).
• [-] If this PR adds/changes features, documentations (in the ./website folder) are updated.
• [ ] CI is passing. Please refer to this page to see how to solve a failed CI.

Remark for PR creator

• ./frb_internal --help shows utilities for development.
• If fzyzcjy does not reply for a few days, maybe he just did not see it, so please ping him.

[fzyzcjy]

Point of discussion is that serde_yaml is now archived/deprecated entirely and will probably be marked as unmaintained in the near future as well https://github.com/rustsec/advisory-db/issues/1925.

Yes I think so...

[atezet]

@fzyzcjy this one's green!