Stabilise third party tests (#348)

Use uv to test with the state of PyPI as of the commit we are testing

.github/workflows/third_party.yml

@@ -103,12 +103,16 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install uv
+        run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install typing_inspect test dependencies
-        run: pip install -r typing_inspect/test-requirements.txt
+        run: |
+          cd typing_inspect
+          uv pip install --system -r test-requirements.txt --exclude-newer $(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)
       - name: Install typing_extensions latest
-        run: pip install ./typing-extensions-latest
+        run: uv pip install --system "typing-extensions @ ./typing-extensions-latest"
       - name: List all installed dependencies
-        run: pip freeze --all
+        run: uv pip freeze
       - name: Run typing_inspect tests
         run: |
           cd typing_inspect
@@ -147,12 +151,16 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
+      - name: Install uv
+        run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install pyanalyze test requirements
-        run: pip install ./pyanalyze[tests]
+        run: |
+          cd pyanalyze
+          uv pip install --system 'pyanalyze[tests] @ .' --exclude-newer $(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)
       - name: Install typing_extensions latest
-        run: pip install ./typing-extensions-latest
+        run: uv pip install --system "typing-extensions @ ./typing-extensions-latest"
       - name: List all installed dependencies
-        run: pip freeze --all
+        run: uv pip freeze
       - name: Run pyanalyze tests
         run: |
           cd pyanalyze
@@ -191,12 +199,16 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
+      - name: Install uv
+        run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install typeguard test requirements
-        run: pip install -e ./typeguard[test]
+        run: |
+          cd typeguard
+          uv pip install --system "typeguard[test] @ ."  --exclude-newer $(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)
       - name: Install typing_extensions latest
-        run: pip install ./typing-extensions-latest
+        run: uv pip install --system "typing-extensions @ ./typing-extensions-latest"
       - name: List all installed dependencies
-        run: pip freeze --all
+        run: uv pip freeze
       - name: Run typeguard tests
         run: |
           cd typeguard
@@ -234,6 +246,8 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install uv
+        run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Configure git for typed-argument-parser tests
         # typed-argument parser does this in their CI,
         # and the tests fail unless we do this
@@ -242,12 +256,13 @@ jobs:
           git config --global user.name "Your Name"
       - name: Install typed-argument-parser test requirements
         run: |
-          pip install -e ./typed-argument-parser
-          pip install pytest
+          cd typed-argument-parser
+          uv pip install --system "typed-argument-parser @ ."  --exclude-newer $(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)
+          uv pip install --system pytest  --exclude-newer $(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)
       - name: Install typing_extensions latest
-        run: pip install ./typing-extensions-latest
+        run: uv pip install --system "typing-extensions @ ./typing-extensions-latest"
       - name: List all installed dependencies
-        run: pip freeze --all
+        run: uv pip freeze
       - name: Run typed-argument-parser tests
         run: |
           cd typed-argument-parser
@@ -286,15 +301,17 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
+      - name: Install uv
+        run: curl -LsSf https://astral.sh/uv/install.sh | sh
       - name: Install mypy test requirements
         run: |
           cd mypy
-          pip install -r test-requirements.txt
-          pip install -e .
+          uv pip install --system -r test-requirements.txt  --exclude-newer $(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)
+          uv pip install --system -e .
       - name: Install typing_extensions latest
-        run: pip install ./typing-extensions-latest
+        run: uv pip install --system "typing-extensions @ ./typing-extensions-latest"
       - name: List all installed dependencies
-        run: pip freeze --all
+        run: uv pip freeze
       - name: Run stubtest & mypyc tests
         run: |
           cd mypy