chore(deps): keep a version alongside the onpair git pin

The onpair dep was a bare git rev with no `version`, which fails the
publish dry-run CI job (Cargo requires a version to package/publish).
Add `version = "0.1.0"` alongside the pin; Cargo only checks a version
is present, so local builds still resolve the pinned commit. Matches the
tpchgen pattern below.

Signed-off-by: Francesco Gargiulo <francesco@spiraldb.com>

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: gargiulofrancesco

Cargo.toml

@@ -192,7 +192,7 @@ num_enum = { version = "0.7.3", default-features = false }
 object_store = { version = "0.13.2", default-features = false }
 once_cell = "1.21"
 oneshot = { version = "0.2.0", features = ["async"] }
-onpair = { git = "https://github.com/spiraldb/onpair.git", rev = "28df115c799674c663adedc8f81620ac82c7a890" }
+onpair = { version = "0.1.0", git = "https://github.com/spiraldb/onpair.git", rev = "28df115c799674c663adedc8f81620ac82c7a890" }
 opentelemetry = "0.32.0"
 opentelemetry-otlp = "0.32.0"
 opentelemetry_sdk = "0.32.0"