chore: remove path deps on tracing crates

Currently, the `v0.1.x` branch's `Cargo.toml` contains path dependencies
on `tracing`, `tracing-core`, `tracing-subscriber` and `tracing-log`,
intended for locally testing changes to those crates against
`tracing-opentelemetry`.

These (obviously) only work when those crates are in the same repo as
`tracing-opentelemetry`, and are breaking the build now that
`tracing-opentelemetry` has moved to its own repo. This commit removes
the path deps.

Author: hawkw

Cargo.toml

@@ -26,10 +26,10 @@ metrics = ["opentelemetry/metrics"]
 
 [dependencies]
 opentelemetry = { version = "0.17.0", default-features = false, features = ["trace"] }
-tracing = { path = "../tracing", version = "0.1.35", default-features = false, features = ["std"] }
-tracing-core = { path = "../tracing-core", version = "0.1.28" }
-tracing-subscriber = { path = "../tracing-subscriber", version = "0.3.0", default-features = false, features = ["registry", "std"] }
-tracing-log = { path = "../tracing-log", version = "0.1.3", default-features = false, optional = true }
+tracing = { version = "0.1.35", default-features = false, features = ["std"] }
+tracing-core = "0.1.28"
+tracing-subscriber = { version = "0.3.0", default-features = false, features = ["registry", "std"] }
+tracing-log = { version = "0.1.3", default-features = false, optional = true }
 once_cell = "1.13.0"
 
 # Fix minimal-versions