chore(deps): update p256 requirement from 0.13 to 0.14 (#959)

* chore(deps): update p256 requirement from 0.13 to 0.14

Updates the requirements on [p256](https://github.com/RustCrypto/elliptic-curves) to permit the latest version.
- [Commits](RustCrypto/elliptic-curves@primeorder/v0.13.0...p256/v0.14.0)

---
updated-dependencies:
- dependency-name: p256
  dependency-version: 0.14.0
  dependency-type: direct:production
...

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

* fix(conformance): update p256 key parsing

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dale Seo <5466341+DaleSeo@users.noreply.github.com>

Author: dependabot[bot]

conformance/Cargo.toml

@@ -32,5 +32,5 @@ anyhow = "1"
 reqwest = { version = "0.13", features = ["json"] }
 urlencoding = "2"
 url = "2"
-p256 = { version = "0.13", features = ["ecdsa"] }
+p256 = { version = "0.14", features = ["ecdsa"] }
 base64 = "0.22"

conformance/src/bin/client.rs

@@ -671,7 +671,7 @@ fn openssl_free_ec_sign(pem: &str, client_id: &str, audience: &str) -> anyhow::R
     let signing_input = format!("{}.{}", header, payload);
 
     // Sign with p256
-    let secret_key = p256::ecdsa::SigningKey::from_bytes(raw_key.as_slice().into())
+    let secret_key = p256::ecdsa::SigningKey::from_slice(raw_key.as_slice())
         .map_err(|e| anyhow::anyhow!("Invalid EC key: {}", e))?;
     use p256::ecdsa::signature::Signer;
     let sig: p256::ecdsa::Signature = secret_key.sign(signing_input.as_bytes());