ci: GitHub Actions use uv lock file to constrain versions used

Author: henryborchers

.github/workflows/tox_matrix.yml

@@ -85,8 +85,8 @@ jobs:
           CONAN_USER_HOME: "${{steps.conan-path-script.outputs.result}}"
         if: "!contains(matrix.os, 'windows') && steps.cache-conan.outputs.cache-hit != 'true'"
         run: |
-          uvx --with cmake conan profile detect --exist-ok
-          uvx --with cmake conan install conanfile.py --build missing -of /tmp/ciwheelbuilder -pr:b=default
+          uv run --only-group=conan --frozen conan profile detect --exist-ok
+          uv run --only-group=conan --frozen conan install conanfile.py --build missing -of /tmp/ciwheelbuilder -pr:b=default
           
 
       - name: Run Tox (Windows)