Update micromamba action

Author: mcbarton

.github/workflows/main.yml

@@ -41,7 +41,7 @@ jobs:
           fetch-depth: 0
 
       - name: install mamba
-        uses: mamba-org/provision-with-micromamba@main
+        uses: mamba-org/setup-micromamba@main
         with:
           environment-file: environment-dev.yml
           environment-name: xeus-cpp
@@ -152,8 +152,9 @@ jobs:
         with:
           fetch-depth: 0
 
+
       - name: Install mamba
-        uses: mamba-org/provision-with-micromamba@main
+        uses: mamba-org/setup-micromamba@main
         with:
           environment-file: environment-wasm-build.yml
           environment-name: xeus-cpp-wasm-build