Bump trybuild from 1.0.86 to 1.0.88 (#563)

Bumps [trybuild](https://github.com/dtolnay/trybuild) from 1.0.86 to 1.0.88.
- [Release notes](https://github.com/dtolnay/trybuild/releases)
- [Commits](dtolnay/trybuild@1.0.86...1.0.88)

---
updated-dependencies:
- dependency-name: trybuild
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.toml

@@ -26,7 +26,7 @@ serde_derive = { version = "1.0" }
 parity-scale-codec-derive = { path = "derive", default-features = false }
 quickcheck = "1.0"
 proptest = "1.3.1"
-trybuild = "1.0.86"
+trybuild = "1.0.88"
 paste = "1"
 
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