chore(ci): bump prefix-dev/setup-pixi from 0.8.12 to 0.8.14 (#160)

Author: dependabot[bot]

.github/workflows/cpp-test.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Checkout source code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
-      - uses: prefix-dev/[email protected].12
+      - uses: prefix-dev/[email protected].14
         with:
           environments: format-cpp
 
@@ -39,7 +39,7 @@ jobs:
       - name: Checkout source code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
-      - uses: prefix-dev/[email protected].12
+      - uses: prefix-dev/[email protected].14
         with:
           environments: test-cpp