Update asn1_der requirement from 0.6.1 to 0.7.2

Updates the requirements on [asn1_der](https://github.com/KizzyCode/asn1_der-rust) to permit the latest version.
- [Release notes](https://github.com/KizzyCode/asn1_der-rust/releases)
- [Commits](KizzyCode/asn1_der-rust@0.6.3...0.7.2)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

core/Cargo.toml

@@ -10,7 +10,7 @@ keywords = ["peer-to-peer", "libp2p", "networking"]
 categories = ["network-programming", "asynchronous"]
 
 [dependencies]
-asn1_der = "0.6.1"
+asn1_der = "0.7.2"
 bs58 = "0.4.0"
 ed25519-dalek = "1.0.1"
 either = "1.5"