Update channels for wasm envs

Author: anutosh491

environment-wasm-build.yml

@@ -1,7 +1,7 @@
 name: xeus-cpp-wasm-build
 channels:
-  - https://repo.prefix.dev/emscripten-forge-dev
-  - conda-forge
+  - https://prefix.dev/emscripten-forge-dev
+  - https://prefix.dev/conda-forge
 dependencies:
   - cmake
   - emscripten_emscripten-wasm32==3.1.73

environment-wasm-host.yml

@@ -1,7 +1,7 @@
 name: xeus-cpp-wasm-host
 channels:
-  - https://repo.prefix.dev/emscripten-forge-dev
-  - https://repo.mamba.pm/conda-forge
+  - https://prefix.dev/emscripten-forge-dev
+  - https://prefix.dev/conda-forge
 dependencies:
   - nlohmann_json=3.12.0
   - xeus-lite