Add label entries for Winch (#5589)

Adds label entries for automatic labelling on pull requests related to Winch.

.github/labeler.yml

@@ -77,3 +77,7 @@
 "wasmtime:ref-types":
   - "crates/wasmtime/src/ref.rs"
   - "crates/runtime/src/externref.rs"
+
+"winch":
+  - "winch/**"
+  - "crates/winch/**"

.github/subscribe-to-label.json

@@ -2,5 +2,6 @@
   "cfallin": ["isle"],
   "fitzgen": ["fuzzing", "isle", "wasmtime:ref-types"],
   "peterhuene": ["wasmtime:api", "wasmtime:c-api"],
-  "kubkon": ["wasi"]
+  "kubkon": ["wasi"],
+  "saulecabrera": ["winch"]
 }