chore: use native pyproject config for tox and pytest

Replace legacy_tox_ini with native [tool.tox] tables (tox>=4.22) and
[tool.pytest.ini_options] with native [tool.pytest] (pytest>=9.0).
Raise the dev dependency floors to match, then relock with pdm and
re-export package/requirements.*.txt.

Author: nandgator

package/requirements.sphinx.txt

@@ -176,9 +176,9 @@ mdurl==0.1.2 \
 myst-parser==3.0.1 \
     --hash=sha256:6457aaa33a5d474aca678b8ead9b3dc298e89c68e67012e73146ea6fd54babf1 \
     --hash=sha256:88f0cb406cb363b077d176b51c476f62d60604d68a8dcdf4832e080441301a87
-packaging==24.1 \
-    --hash=sha256:026ed72c8ed3fcce5bf8950572258698927fd1dbda10a5e981cdf0ac37f4f002 \
-    --hash=sha256:5b8f2217dbdbd2f7f384c41c628544e6d52f2d0f53c6d0c3ea61aa5d1d7ff124
+packaging==26.3 \
+    --hash=sha256:94edc256424af38762eb31306eed28beb9f0efc50a8837492c9d6fd6004aed79 \
+    --hash=sha256:d7193f7c8e4e93f444fde0262bf90af30e16fa0ad0ad44cb553c87339b23cd1c
 pycryptodome==3.20.0 \
     --hash=sha256:09609209ed7de61c2b560cc5c8c4fbf892f8b15b1faf7e4cbffac97db1fffda7 \
     --hash=sha256:210ba1b647837bfc42dd5a813cdecb5b86193ae11a3f5d972b9a0ae2c7e9e4b4 \

package/requirements.testing.txt

@@ -10,12 +10,12 @@ eth-hash[pycryptodome]==0.7.0 \
 iniconfig==2.0.0 \
     --hash=sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3 \
     --hash=sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374
-packaging==24.1 \
-    --hash=sha256:026ed72c8ed3fcce5bf8950572258698927fd1dbda10a5e981cdf0ac37f4f002 \
-    --hash=sha256:5b8f2217dbdbd2f7f384c41c628544e6d52f2d0f53c6d0c3ea61aa5d1d7ff124
-pluggy==1.5.0 \
-    --hash=sha256:2cffa88e94fdc978c4c574f15f9e59b7f4201d439195c3715ca9e2486f1d0cf1 \
-    --hash=sha256:44e1ad92c8ca002de6377e165f3e0f1be63266ab4d554740532335b9d75ea669
+packaging==26.3 \
+    --hash=sha256:94edc256424af38762eb31306eed28beb9f0efc50a8837492c9d6fd6004aed79 \
+    --hash=sha256:d7193f7c8e4e93f444fde0262bf90af30e16fa0ad0ad44cb553c87339b23cd1c
+pluggy==1.6.0 \
+    --hash=sha256:7dcc130b76258d33b90f61b658791dede3486c3e6bfb003ee5c9bfb396dd22f3 \
+    --hash=sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746
 pycryptodome==3.20.0 \
     --hash=sha256:09609209ed7de61c2b560cc5c8c4fbf892f8b15b1faf7e4cbffac97db1fffda7 \
     --hash=sha256:210ba1b647837bfc42dd5a813cdecb5b86193ae11a3f5d972b9a0ae2c7e9e4b4 \

package/requirements.tooling.txt

@@ -13,12 +13,12 @@ iniconfig==2.0.0 \
 nodeenv==1.9.1 \
     --hash=sha256:6ec12890a2dab7946721edbfbcd91f3319c6ccc9aec47be7c7e6b7011ee6645f \
     --hash=sha256:ba11c9782d29c27c70ffbdda2d7415098754709be8a7056d79a737cd901155c9
-packaging==24.1 \
-    --hash=sha256:026ed72c8ed3fcce5bf8950572258698927fd1dbda10a5e981cdf0ac37f4f002 \
-    --hash=sha256:5b8f2217dbdbd2f7f384c41c628544e6d52f2d0f53c6d0c3ea61aa5d1d7ff124
-pluggy==1.5.0 \
-    --hash=sha256:2cffa88e94fdc978c4c574f15f9e59b7f4201d439195c3715ca9e2486f1d0cf1 \
-    --hash=sha256:44e1ad92c8ca002de6377e165f3e0f1be63266ab4d554740532335b9d75ea669
+packaging==26.3 \
+    --hash=sha256:94edc256424af38762eb31306eed28beb9f0efc50a8837492c9d6fd6004aed79 \
+    --hash=sha256:d7193f7c8e4e93f444fde0262bf90af30e16fa0ad0ad44cb553c87339b23cd1c
+pluggy==1.6.0 \
+    --hash=sha256:7dcc130b76258d33b90f61b658791dede3486c3e6bfb003ee5c9bfb396dd22f3 \
+    --hash=sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746
 pycryptodome==3.20.0 \
     --hash=sha256:09609209ed7de61c2b560cc5c8c4fbf892f8b15b1faf7e4cbffac97db1fffda7 \
     --hash=sha256:210ba1b647837bfc42dd5a813cdecb5b86193ae11a3f5d972b9a0ae2c7e9e4b4 \