chore: Upgrade to Fable 5.3 (#321)

Bump the fable dotnet tool to 5.3.0 and fable-library to 5.3.0.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: dbrattli

.config/dotnet-tools.json

@@ -10,7 +10,7 @@
       "rollForward": false
     },
     "fable": {
-      "version": "5.2.0",
+      "version": "5.3.0",
       "commands": [
         "fable"
       ],

pyproject.toml

@@ -7,7 +7,7 @@ requires-python = ">= 3.12, < 4"
 readme = "README.md"
 license = "MIT"
 dependencies = [
-    "fable-library==5.2.0",
+    "fable-library==5.3.0",
     "pyright>=1.1.410",
 ]