DO NOT MERGE: pin rustls-pki-types to 0.2.2

Should fix `rustls-webpki` alpha7.

https://github.com/sigstore/sigstore-rs/actions/runs/7026532632/job/19119424336?pr=310
Signed-off-by: Andrew Pan <andrew.pan@trailofbits.com>

Cargo.toml

@@ -123,7 +123,7 @@ x509-cert = { version = "0.2.2", features = ["builder", "pem", "std"] }
 crypto_secretbox = "0.1.1"
 zeroize = "1.5.7"
 rustls-webpki = { version = "0.102.0-alpha.7", features = ["alloc"] }
-rustls-pki-types = { version = "0.2.1", features = ["std"] }
+rustls-pki-types = { version = "=0.2.2", features = ["std"] }
 serde_repr = "0.1.16"
 hex = "0.4.3"
 json-syntax = { version = "0.9.6", features = ["canonicalize", "serde"] }