Fix setuptools on newer Sphinx with Python 3.12 and 3.13

Author: domdfcoding

repo_helper.yml

@@ -182,6 +182,7 @@ third_party_version_matrix:
 
 exclude_files:
  - contributing
+ - tox
 
 sphinx_conf_epilogue:
  - pypi_name = "chemistry_tools"

tox.ini

@@ -287,6 +287,9 @@ commands =
     python -m pytest --cov=sphinxcontrib.extras_require -r aR tests/ {posargs}
 
 [testenv:py{39,310,311,312,313-dev,py39}-sphinx7.2]
+setenv =
+    PYTHONDEVMODE=1
+    PIP_DISABLE_PIP_VERSION_CHECK=1
 deps =
     -r{toxinidir}/tests/requirements.txt
     -r{toxinidir}/requirements.txt
@@ -297,6 +300,9 @@ commands =
     python -m pytest --cov=sphinxcontrib.extras_require -r aR tests/ {posargs}
 
 [testenv:py{39,310,311,312,313-dev,py39}-sphinx7.3]
+setenv =
+    PYTHONDEVMODE=1
+    PIP_DISABLE_PIP_VERSION_CHECK=1
 deps =
     -r{toxinidir}/tests/requirements.txt
     -r{toxinidir}/requirements.txt
@@ -307,6 +313,9 @@ commands =
     python -m pytest --cov=sphinxcontrib.extras_require -r aR tests/ {posargs}
 
 [testenv:py{39,310,311,312,313-dev,py39}-sphinx7.4]
+setenv =
+    PYTHONDEVMODE=1
+    PIP_DISABLE_PIP_VERSION_CHECK=1
 deps =
     -r{toxinidir}/tests/requirements.txt
     -r{toxinidir}/requirements.txt
@@ -317,6 +326,9 @@ commands =
     python -m pytest --cov=sphinxcontrib.extras_require -r aR tests/ {posargs}
 
 [testenv:py{310,311,312,313-dev}-sphinx8.0]
+setenv =
+    PYTHONDEVMODE=1
+    PIP_DISABLE_PIP_VERSION_CHECK=1
 deps =
     -r{toxinidir}/tests/requirements.txt
     -r{toxinidir}/requirements.txt
@@ -327,6 +339,9 @@ commands =
     python -m pytest --cov=sphinxcontrib.extras_require -r aR tests/ {posargs}
 
 [testenv:py{310,311,312,313-dev}-sphinx8.1]
+setenv =
+    PYTHONDEVMODE=1
+    PIP_DISABLE_PIP_VERSION_CHECK=1
 deps =
     -r{toxinidir}/tests/requirements.txt
     -r{toxinidir}/requirements.txt
@@ -337,6 +352,9 @@ commands =
     python -m pytest --cov=sphinxcontrib.extras_require -r aR tests/ {posargs}
 
 [testenv:py{311,312,313-dev}-sphinx8.2]
+setenv =
+    PYTHONDEVMODE=1
+    PIP_DISABLE_PIP_VERSION_CHECK=1
 deps =
     -r{toxinidir}/tests/requirements.txt
     -r{toxinidir}/requirements.txt