chore(deps): bump opentelemetry-proto in the opentelemetry group

Bumps the opentelemetry group with 1 update: [opentelemetry-proto](https://github.com/open-telemetry/opentelemetry-rust).


Updates `opentelemetry-proto` from 0.25.0 to 0.26.1
- [Release notes](https://github.com/open-telemetry/opentelemetry-rust/releases)
- [Commits](open-telemetry/opentelemetry-rust@opentelemetry-proto-0.25.0...opentelemetry-proto-0.26.1)

---
updated-dependencies:
- dependency-name: opentelemetry-proto
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: opentelemetry
...

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

crates/synd_o11y/Cargo.toml

@@ -34,7 +34,7 @@ opentelemetry-stdout = ["dep:opentelemetry-stdout"]
 
 [dev-dependencies]
 insta               = { workspace = true, features = ["yaml", "redactions"] }
-opentelemetry-proto = { version = "0.25.0", features = ["gen-tonic", "trace", "metrics", "logs", "with-serde"] }
+opentelemetry-proto = { version = "0.26.1", features = ["gen-tonic", "trace", "metrics", "logs", "with-serde"] }
 tokio               = { workspace = true, features = ["macros", "rt-multi-thread", "sync"] }
 tonic               = { version = "0.12.3", features = ["transport"] }