Update actions/setup-python action to v7 (#51)

Internal refactor of the action and removal of the `pip-install` option, which
the project doesn't use.

Author: renovate[bot]

.github/actions/setup-cli/action.yml

@@ -11,7 +11,7 @@ runs:
   using: "composite"
   steps:
     - name: Set up Python
-      uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
+      uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
       with:
         python-version: '3.13'
 

.github/workflows/ci-pipx.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/configure-git
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
         with:
           python-version: ${{ inputs.python-version }}
 

.github/workflows/ci-uv.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
         with:
           persist-credentials: false
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
         with:
           python-version: ${{ inputs.python-version }}
       - uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
@@ -44,7 +44,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/configure-git
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
         with:
           python-version: ${{ inputs.python-version }}
       - uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
@@ -66,7 +66,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/configure-git
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
         with:
           python-version: ${{ inputs.python-version }}
       - uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2