Bump thiserror from 1.0.63 to 1.0.68

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 1.0.63 to 1.0.68.
- [Release notes](https://github.com/dtolnay/thiserror/releases)
- [Commits](dtolnay/thiserror@1.0.63...1.0.68)

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

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -13,7 +13,7 @@ serde_derive = "1.0.152"
 # https://github.com/thedodd/wither/pull/89#issuecomment-1023644443
 wither = { git = "https://github.com/thedodd/wither", rev = "52fd503" }
 futures = "0.3.30"
-thiserror = "1.0.63"
+thiserror = "1.0.68"
 axum = { version = "0.7.5" }
 tokio = { version = "1.39.1", features = ["full"] }
 tracing = "0.1.40"