chore(deps): bump tokio 1.49 -> 1.50

Patch bump of the async runtime (dependabot Hmbown#3343). Raises the floor
spec from 1.49.0 to 1.50.0 in the workspace and codewhale-tui manifests
and pins Cargo.lock to tokio 1.50.0 (with its semver-compatible
transitive deps mio/socket2).

Verified: cargo check -p codewhale-tui --locked; focused gate test
(saved_default_provider_syncs_back_to_runtime_config); client:: suite
(205 passed, the async-heavy surface most affected by a tokio bump).

Other dependabot PRs deferred to a dedicated dependency-triage pass:
Hmbown#3341 lru (bumping to 0.18 creates a duplicate version since a transitive
dep still pins 0.16), Hmbown#3339 windows, Hmbown#3342 similar (2->3 major),
Hmbown#3340 toml (0->1 major), and Hmbown#3334-Hmbown#3338 GitHub Actions (not locally
verifiable; only run in CI).

Refs Hmbown#3343.

Author: Hmbown

Cargo.lock

@@ -46,7 +46,7 @@ serde_json = "1.0.149"
 semver = "1.0.28"
 thiserror = "2.0"
 tempfile = "3.27"
-tokio = { version = "1.49.0", features = ["full"] }
+tokio = { version = "1.50.0", features = ["full"] }
 toml = "0.9.7"
 toml_edit = "0.23.10"
 sha2 = "0.10"

Cargo.toml

@@ -51,7 +51,7 @@ serde_json = { version = "1.0.149", features = ["preserve_order"] }
 schemars = { version = "1.2.1", features = ["derive", "preserve_order"] }
 shellexpand = "3"
 toml = "0.9.7"
-tokio = { version = "1.49.0", features = ["full"] }
+tokio = { version = "1.50.0", features = ["full"] }
 tokio-util = { version = "0.7.16", features = ["io"] }
 unicode-width = "0.2"
 unicode-segmentation = "1.12"