deps: remove picky-rs dependency

This is no longer needed since we've moved to rustls-webpki

This closese sigstore#308

Signed-off-by: Flavio Castelli <[email protected]>

Author: flavio

Cargo.toml

@@ -89,9 +89,6 @@ p256 = "0.13.2"
 p384 = "0.13"
 webbrowser = "0.8.4"
 pem = "3.0"
-picky = { version = "7.0.0-rc.8", default-features = false, features = [
-  "x509",
-] }
 pkcs1 = { version = "0.7.5", features = ["std"] }
 pkcs8 = { version = "0.10.2", features = [
   "pem",