fix: bump pnpm to 11.5.3 and remove from mise (use corepack)

11.5.2 hit minimumReleaseAge constraints. Removed pnpm from .mise.toml
since corepack handles it via packageManager in package.json.

.mise.toml

@@ -1,3 +1,2 @@
 [tools]
 node = "24.16.0"
-pnpm = "11.5.2"

deployments/prebuilt-debian/package.json

@@ -8,5 +8,5 @@
     "node": ">=24.16.0",
     "pnpm": ">=11.0.0"
   },
-  "packageManager": "pnpm@11.5.2"
+  "packageManager": "pnpm@11.5.3"
 }

package.json

@@ -64,7 +64,7 @@
     "node": ">=24.16.0",
     "pnpm": ">=11.0.0"
   },
-  "packageManager": "pnpm@11.5.2",
+  "packageManager": "pnpm@11.5.3",
   "dependencies": {
     "jsonpath-plus": "catalog:"
   }