Bump log from 0.4.19 to 0.4.20 in /lang/rust (#2440)

Bumps [log](https://github.com/rust-lang/log) from 0.4.19 to 0.4.20.
- [Release notes](https://github.com/rust-lang/log/releases)
- [Changelog](https://github.com/rust-lang/log/blob/master/CHANGELOG.md)
- [Commits](rust-lang/log@0.4.19...0.4.20)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

lang/rust/avro/Cargo.toml

@@ -61,7 +61,7 @@ crc32fast = { default-features = false, version = "1.3.2", optional = true }
 digest = { default-features = false, version = "0.10.7", features = ["core-api"] }
 lazy_static = { default-features = false, version = "1.4.0" }
 libflate = { default-features = false, version = "2.0.0", features = ["std"] }
-log = { default-features = false, version = "0.4.19" }
+log = { default-features = false, version = "0.4.20" }
 num-bigint = { default-features = false, version = "0.4.3" }
 regex = { default-features = false, version = "1.9.3", features = ["std", "perf"] }
 serde = { default-features = false, version = "1.0.180", features = ["derive"] }

lang/rust/avro_test_helper/Cargo.toml

@@ -36,5 +36,5 @@ color-backtrace = { default-features = false, version = "0.5.1" }
 ctor = { default-features = false, version = "0.2.4" }
 env_logger = { default-features = false, version = "0.10.0" }
 lazy_static = { default-features = false, version = "1.4.0" }
-log = { default-features = false, version = "0.4.19" }
+log = { default-features = false, version = "0.4.20" }
 ref_thread_local = { default-features = false, version = "0.1.1" }