Use pixi 0.66.0 in CI.

Author: hmgaudecker

.github/workflows/main.yml

@@ -28,7 +28,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.65.0
+          pixi-version: v0.66.0
           cache: true
           cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
           environments: tests-cpu
@@ -54,7 +54,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.65.0
+          pixi-version: v0.66.0
           cache: true
           cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
           frozen: true