Bump der from 0.7.8 to 0.7.9 (#60)

Bumps [der](https://github.com/RustCrypto/formats) from 0.7.8 to 0.7.9.
- [Commits](RustCrypto/formats@der/v0.7.8...der/v0.7.9)

---
updated-dependencies:
- dependency-name: der
  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>

Author: dependabot[bot]

Cargo.lock

@@ -11,7 +11,7 @@ aead = { version = "0.5.2", default-features = false }
 aes-gcm = { version = "0.10.3", default-features = false, features = ["aes", "alloc"] }
 chacha20poly1305 = { version = "0.10.1", default-features = false }
 crypto-common = { version = "0.1.6", default-features = false }
-der = { version = "0.7.8", default-features = false }
+der = { version = "0.7.9", default-features = false }
 digest = { version = "0.10.7", default-features = false }
 ecdsa = { version = "0.16.8", default-features = false, features = ["alloc"] }
 ed25519-dalek = { version = "2", default-features = false, features = ["pkcs8"] }