CI: Install GitHub Actions' Python after OS depenencies

Homebrew doesn't like it when it can't overwrite system locations of
Python, so try setting up the Actions' Python after it.

Author: QuLogic

.github/workflows/tests.yml

@@ -115,20 +115,6 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
-        if: matrix.python-version != '3.13t'
-        with:
-          python-version: ${{ matrix.python-version }}
-          allow-prereleases: true
-
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: deadsnakes/action@e640ac8743173a67cca4d7d77cd837e514bf98e8  # v3.2.0
-        if: matrix.python-version == '3.13t'
-        with:
-          python-version: '3.13'
-          nogil: true
-
       - name: Install OS dependencies
         run: |
           case "${{ runner.os }}" in
@@ -194,6 +180,20 @@ jobs:
             ;;
           esac
 
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        if: matrix.python-version != '3.13t'
+        with:
+          python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: deadsnakes/action@e640ac8743173a67cca4d7d77cd837e514bf98e8  # v3.2.0
+        if: matrix.python-version == '3.13t'
+        with:
+          python-version: '3.13'
+          nogil: true
+
       - name: Cache pip
         uses: actions/cache@v4
         if: startsWith(runner.os, 'Linux')