Update astral-sh/setup-uv action to v4

Author: renovate[bot]

.github/workflows/mypy.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@v4
         with:
           enable-cache: true
           cache-dependency-glob: "uv.lock"

.github/workflows/testing.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@v4
         with:
           enable-cache: true
           cache-dependency-glob: "uv.lock"