ci: point base-setup at maintainer-tools PR #307 to benchmark uv hatch install

Temporarily pin the base-setup action to Carreau/maintainer-tools@6a67ae9
(jupyterlab/maintainer-tools#307) so this branch's CI exercises the
`uv`-based hatch install and we can compare timings against `v1`.

This must be reverted to `jupyterlab/maintainer-tools/.../base-setup@v1`
before merge, once the change is released upstream.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UrZa3buGeFBYyfRZ2keuA4

Author: claude

.github/workflows/tests.yml

@@ -35,7 +35,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v7
-      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           python_package_manager: "uv pip"
       - name: Run Tests
@@ -57,7 +57,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Base Setup
-        uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+        uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           dependency_type: minimum
           python_package_manager: "uv pip"
@@ -70,7 +70,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
-      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           python_package_manager: "uv pip"
       - name: Run Linters
@@ -85,7 +85,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
-      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           python_package_manager: "uv pip"
       - name: Build the docs
@@ -99,7 +99,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v7
       - name: Base Setup
-        uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+        uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           dependency_type: pre
           python_package_manager: "uv pip"
@@ -113,7 +113,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@v7
-      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           python_package_manager: "uv pip"
       - uses: jupyterlab/maintainer-tools/.github/actions/make-sdist@v1
@@ -124,7 +124,7 @@ jobs:
     name: Install from SDist and Test
     timeout-minutes: 20
     steps:
-      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           python_package_manager: "uv pip"
       - uses: jupyterlab/maintainer-tools/.github/actions/test-sdist@v1
@@ -133,7 +133,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           python_package_manager: "uv pip"
       - uses: jupyterlab/maintainer-tools/.github/actions/check-links@v1
@@ -144,7 +144,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v7
       - name: Base Setup
-        uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+        uses: Carreau/maintainer-tools/.github/actions/base-setup@6a67ae951dee64e6430324f72531299e5cd9709f
         with:
           python_package_manager: "uv pip"
       - name: Install Dependencies