build(deps): bump serde-json-wasm in /contracts/pricefeed (#123)

Bumps [serde-json-wasm](https://github.com/CosmWasm/serde-json-wasm) from 0.4.1 to 0.5.2.
- [Changelog](https://github.com/CosmWasm/serde-json-wasm/blob/v0.5.2/CHANGELOG.md)
- [Commits](CosmWasm/serde-json-wasm@v0.4.1...v0.5.2)

---
updated-dependencies:
- dependency-name: serde-json-wasm
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Unique Divine <[email protected]>