fix(deps): update rust crate tracing-subscriber to 0.3.20 [security] (#134)

| datasource | package            | from   | to     |
| ---------- | ------------------ | ------ | ------ |
| crate      | tracing-subscriber | 0.3.17 | 0.3.20 |

Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>
Co-authored-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

crates/grafana-plugin-sdk/Cargo.toml

@@ -34,7 +34,7 @@ tracing = "0.1.37"
 tracing-core = "0.1.31"
 tracing-log = "0.2.0"
 tracing-serde = "0.2.0"
-tracing-subscriber = { version = "0.3.17", features = [
+tracing-subscriber = { version = "0.3.20", features = [
   "env-filter",
   "json",
   "time",