Bump prefix-dev/setup-pixi from 0.8.3 to 0.8.4 in the actions group (#1132)

Author: dependabot[bot]

.github/workflows/linters.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: prefix-dev/[email protected].3
+      - uses: prefix-dev/[email protected].4
         with:
           pixi-version: v0.39.2
           frozen: true

.github/workflows/tests.yml

@@ -37,7 +37,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
-      - uses: prefix-dev/[email protected].3
+      - uses: prefix-dev/[email protected].4
         with:
           pixi-version: v0.39.2
           environments: ${{ matrix.environment }}