Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -195,7 +195,7 @@ jobs:
             micromamba_shell_init: bash
           - name: osx15-arm
             os: macos-15
-           micromamba_shell_init: bash
+            micromamba_shell_init: bash
 
     steps:
       - uses: actions/checkout@v4