Update xtl from 0.8.1 to 0.8.2 (emscripten-forge#4736)

* Update xtl from 0.8.1 to 0.8.2

* Add tests

---------

Co-authored-by: emscripten-forge-bot <emscripten-forge-bot@users.noreply.github.com>
Co-authored-by: Isabel Paredes <isabel.paredes@quantstack.net>

Author: emscripten-forge-bot

recipes/recipes_emscripten/xtl/recipe.yaml

@@ -1,14 +1,14 @@
 context:
   name: xtl
-  version: 0.8.1
+  version: 0.8.2
 
 package:
   name: ${{ name}}
   version: ${{ version }}
 
 source:
   url: https://github.com/xtensor-stack/${{ name }}/archive/refs/tags/${{ version }}.tar.gz
-  sha256: e69a696068ccffd2b435539d583665981b6c6abed596a72832bffbe3e13e1f49
+  sha256: 8fb38d6a5856aab5740d2ccb3d791d289f648d4cc506b94a1338fe5fce100c11
 
 build:
   number: 0
@@ -19,6 +19,11 @@ requirements:
   - cmake
   - ninja
 
+tests:
+- package_contents:
+    files:
+    - include/xtl/**/*.hpp
+
 about:
   homepage: https://github.com/xtensor-stack/xtl
   license: BSD-3-Clause