Bump solana-logger from 1.3.14 to 1.3.15 (#564)

Bumps [solana-logger](https://github.com/solana-labs/solana) from 1.3.14 to 1.3.15.
- [Release notes](https://github.com/solana-labs/solana/releases)
- [Changelog](https://github.com/solana-labs/solana/blob/master/RELEASE.md)
- [Commits](solana-labs/solana@v1.3.14...v1.3.15)

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

Cargo.lock

@@ -17,7 +17,7 @@ solana-clap-utils = { version = "=1.3.14"}
 solana-cli-config = { version = "=1.3.15" }
 solana-cli-output = { version = "=1.3.14" }
 solana-client = { version = "=1.3.14" }
-solana-logger = { version = "=1.3.14" }
+solana-logger = { version = "=1.3.15" }
 solana-sdk = { version = "=1.3.14" }
 spl-token = { version = "2.0", path="../program" }