[codex] Fix current main CI blockers (#17917)

## Summary
- Fix marketplace-add local path detection on Windows by using
`Path::is_absolute()`.
- Make marketplace-add local-source tests parse/write TOML through the
same helpers instead of raw string matching.
- Update `rand` 0.9.x to 0.9.3 and document the remaining audited `rand`
0.8.5 advisory exception.
- Refresh `MODULE.bazel.lock` after the Cargo.lock update.

## Why
Latest `main` had two independent CI blockers: marketplace-add tests
were not portable to Windows path/TOML escaping, and cargo-deny still
reported `RUSTSEC-2026-0097` after the recent rustls-webpki fix.

## Validation
- `cargo test -p codex-core marketplace_add -- --nocapture`
- `cargo deny --all-features check`
- `just bazel-lock-check`
- `just fix -p codex-core`
- `just fmt`
- `git diff --check`

codex-rs/Cargo.lock

@@ -1729,7 +1729,7 @@ dependencies = [
  "opentelemetry",
  "opentelemetry_sdk",
  "pretty_assertions",
- "rand 0.9.2",
+ "rand 0.9.3",
  "reqwest",
  "rustls",
  "rustls-native-certs",
@@ -1974,7 +1974,7 @@ dependencies = [
  "opentelemetry_sdk",
  "predicates",
  "pretty_assertions",
- "rand 0.9.2",
+ "rand 0.9.3",
  "regex-lite",
  "reqwest",
  "rmcp",
@@ -2327,7 +2327,7 @@ dependencies = [
  "once_cell",
  "os_info",
  "pretty_assertions",
- "rand 0.9.2",
+ "rand 0.9.3",
  "regex-lite",
  "reqwest",
  "serde",
@@ -2722,7 +2722,7 @@ dependencies = [
  "codex-keyring-store",
  "keyring",
  "pretty_assertions",
- "rand 0.9.2",
+ "rand 0.9.3",
  "regex",
  "schemars 0.8.22",
  "serde",
@@ -2921,7 +2921,7 @@ dependencies = [
  "pathdiff",
  "pretty_assertions",
  "pulldown-cmark",
- "rand 0.9.2",
+ "rand 0.9.3",
  "ratatui",
  "ratatui-macros",
  "regex-lite",
@@ -5163,7 +5163,7 @@ dependencies = [
  "idna",
  "ipnet",
  "once_cell",
- "rand 0.9.2",
+ "rand 0.9.3",
  "ring",
  "thiserror 2.0.18",
  "tinyvec",
@@ -5185,7 +5185,7 @@ dependencies = [
  "moka",
  "once_cell",
  "parking_lot",
- "rand 0.9.2",
+ "rand 0.9.3",
  "resolv-conf",
  "smallvec",
  "thiserror 2.0.18",
@@ -7331,7 +7331,7 @@ dependencies = [
  "futures-util",
  "opentelemetry",
  "percent-encoding",
- "rand 0.9.2",
+ "rand 0.9.3",
  "thiserror 2.0.18",
  "tokio",
  "tokio-stream",
@@ -7880,7 +7880,7 @@ checksum = "bee689443a2bd0a16ab0348b52ee43e3b2d1b1f931c8aa5c9f8de4c86fbe8c40"
 dependencies = [
  "bitflags 2.10.0",
  "num-traits",
- "rand 0.9.2",
+ "rand 0.9.3",
  "rand_chacha 0.9.0",
  "rand_xorshift",
  "regex-syntax 0.8.8",
@@ -8051,7 +8051,7 @@ dependencies = [
  "bytes",
  "getrandom 0.3.4",
  "lru-slab",
- "rand 0.9.2",
+ "rand 0.9.3",
  "ring",
  "rustc-hash 2.1.1",
  "rustls",
@@ -8183,7 +8183,7 @@ dependencies = [
  "rama-http-types",
  "rama-net",
  "rama-utils",
- "rand 0.9.2",
+ "rand 0.9.3",
  "serde",
  "serde_html_form",
  "serde_json",
@@ -8253,7 +8253,7 @@ dependencies = [
  "rama-macros",
  "rama-net",
  "rama-utils",
- "rand 0.9.2",
+ "rand 0.9.3",
  "serde",
  "sha1",
 ]
@@ -8281,7 +8281,7 @@ dependencies = [
  "rama-error",
  "rama-macros",
  "rama-utils",
- "rand 0.9.2",
+ "rand 0.9.3",
  "serde",
  "serde_json",
  "sync_wrapper",
@@ -8355,7 +8355,7 @@ dependencies = [
  "rama-http-types",
  "rama-net",
  "rama-utils",
- "rand 0.9.2",
+ "rand 0.9.3",
  "tokio",
 ]
 
@@ -8435,9 +8435,9 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.9.2"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6db2770f06117d490610c7488547d543617b21bfa07796d7a12f6f1bd53850d1"
+checksum = "7ec095654a25171c2124e9e3393a930bddbffdc939556c914957a4c3e0a87166"
 dependencies = [
  "rand_chacha 0.9.0",
  "rand_core 0.9.5",
@@ -8752,7 +8752,7 @@ dependencies = [
  "pastey",
  "pin-project-lite",
  "process-wrap",
- "rand 0.9.2",
+ "rand 0.9.3",
  "reqwest",
  "rmcp-macros",
  "schemars 1.2.1",
@@ -9336,7 +9336,7 @@ version = "0.46.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26ab054c34b87f96c3e4701bea1888317cde30cc7e4a6136d2c48454ab96661c"
 dependencies = [
- "rand 0.9.2",
+ "rand 0.9.3",
  "sentry-types",
  "serde",
  "serde_json",
@@ -9384,7 +9384,7 @@ checksum = "eecbd63e9d15a26a40675ed180d376fcb434635d2e33de1c24003f61e3e2230d"
 dependencies = [
  "debugid",
  "hex",
- "rand 0.9.2",
+ "rand 0.9.3",
  "serde",
  "serde_json",
  "thiserror 2.0.18",
@@ -11169,7 +11169,7 @@ dependencies = [
  "http 1.4.0",
  "httparse",
  "log",
- "rand 0.9.2",
+ "rand 0.9.3",
  "rustls",
  "rustls-pki-types",
  "sha1",