Ensure uv uses same constraints as pip

tox.ini

@@ -1,6 +1,7 @@
 [tox]
 requires =
-    tox>=4.11.3
+    tox>=4.23.2
+    tox-uv>=1.19
 env_list =
     py
     deps
@@ -27,6 +28,7 @@ pass_env =
     USER
 set_env =
     !milestone: PIP_CONSTRAINT = {toxinidir}/.config/constraints.txt
+    !milestone: UV_CONSTRAINT = {toxinidir}/.config/constraints.txt
     COVERAGE_COMBINED = {envdir}/.coverage
     COVERAGE_FILE = {env:COVERAGE_FILE:{envdir}/.coverage.{envname}}
     COVERAGE_PROCESS_START = {toxinidir}/pyproject.toml
@@ -57,6 +59,7 @@ deps =
 extras =
 set_env =
     PIP_CONSTRAINT = /dev/null
+    UV_CONSTRAINT = /dev/null
 commands_pre =
 commands =
     -pre-commit run --all-files --show-diff-on-failure --hook-stage manual deps
@@ -81,8 +84,10 @@ description = Enforce quality standards under {basepython}
 skip_install = true
 deps =
     pre-commit
+    pre-commit-uv>=4.1.4
 set_env =
     PIP_CONSTRAINT = /dev/null
+    UV_CONSTRAINT = /dev/null
 commands =
     pre-commit run --show-diff-on-failure --all-files
 
@@ -94,6 +99,7 @@ deps =
 set_env =
     {[testenv]set_env}
     PIP_CONSTRAINT = /dev/null
+    UV_CONSTRAINT = /dev/null
 
 [testenv:pkg]
 description =