Bump cdn-marshal from 0.4.5 to 0.5.6

Bumps [cdn-marshal](https://github.com/EspressoSystems/Push-CDN) from 0.4.5 to 0.5.6.
- [Release notes](https://github.com/EspressoSystems/Push-CDN/releases)
- [Commits](EspressoSystems/Push-CDN@f6cc7c2...9409763)

---
updated-dependencies:
- dependency-name: cdn-marshal
  dependency-type: direct:production
...

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

Cargo.toml

@@ -81,7 +81,7 @@ hotshot-example-types = { git = "https://github.com/EspressoSystems/hotshot", ta
 
 # Push CDN imports
 cdn-broker = { git = "https://github.com/EspressoSystems/Push-CDN", tag = "0.4.5", package = "cdn-broker" }
-cdn-marshal = { git = "https://github.com/EspressoSystems/Push-CDN", tag = "0.4.5", package = "cdn-marshal" }
+cdn-marshal = { git = "https://github.com/EspressoSystems/Push-CDN", tag = "0.5.6", package = "cdn-marshal" }
 
 jf-plonk = { git = "https://github.com/EspressoSystems/jellyfish", tag = "jf-plonk-v0.5.1", features = [
   "test-apis",