Update rustls to 0.23.45 for RUSTSEC-2026-0285

rustls 0.23.43 accepted TLS 1.3 handshake messages sent at the wrong
encryption level when they followed a key-changing message in the same
record, where RFC 8446 requires the connection to be terminated. The
transcript is still authenticated, so a handshake cannot be altered, but
a peer could send in plaintext what should be encrypted. It reaches the
agent through tonic -> tokio-rustls, on its mTLS gRPC link to ingest.
Fixed in 0.23.45, inside the existing range, so only the lockfile moves.

The advisory was published after main last passed, so the agent's
cargo-deny advisories job failed on every open PR, including ones that
never touched Rust.

Also drops the RUSTSEC-2025-0134 ignore from agent/deny.toml. Its own
reason said to delete it once tonic stopped pulling in rustls-pemfile;
tonic 0.14 no longer does, and cargo-deny warned the advisory was not
encountered.

Signed-off-by: John Coffey <[email protected]>

agent/Cargo.lock

@@ -823,9 +823,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.43"
+version = "0.23.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0283386ce02abc0151e1761d08802dfe86c173b0b494af5cbc086574e453da06"
+checksum = "0d41d731c7d2f962d1ccc364cec258de3c0e93b38c2fb3ba97ac74513048d634"
 dependencies = [
  "log",
  "once_cell",

agent/deny.toml

@@ -70,22 +70,6 @@ feature-depth = 1
 # A list of advisory IDs to ignore. Note that ignored advisories will still
 # output a note when they are encountered.
 ignore = [
-    { id = "RUSTSEC-2025-0134", reason = """
-`rustls-pemfile` is unmaintained -- its repository was archived in
-August 2025. A maintenance advisory, not a vulnerability: no CVE, no
-known exploit, and the advisory itself states "No safe upgrade is
-available".
-
-It reaches us transitively (cairnobs-agent -> tonic 0.12.3 ->
-rustls-pemfile 2.2.0), so there is nothing to fix on our side; the
-upstream migration is tonic's to make, to the PemObject API that
-rustls-pki-types has carried since 1.9.0. The last rustls-pemfile
-release is a thin wrapper over that same code, so the archived crate is
-not running different logic from its replacement.
-
-Revisit when tonic is next upgraded -- check whether it has moved to
-rustls-pki-types directly, and delete this entry if so rather than
-letting it become permanent.""" },
     #"RUSTSEC-0000-0000",
     #{ id = "RUSTSEC-0000-0000", reason = "you can specify a reason the advisory is ignored" },
     #"[email protected]", # you can also ignore yanked crate versions if you wish