fix(test): Properly modify httpx anyio pin

Previous commit did not properly modify the version pin to the new required one for httpcore asyncio

GH-4601

Author: srothh

scripts/populate_tox/tox.jinja

@@ -207,7 +207,7 @@ deps =
     httpx-v0.25: pytest-httpx==0.25.0
     httpx: pytest-httpx
     # anyio is a dep of httpx
-    httpx: anyio<4.0.0
+    httpx: anyio>=3,<5
     httpx-v0.16: httpx~=0.16.0
     httpx-v0.18: httpx~=0.18.0
     httpx-v0.20: httpx~=0.20.0

tox.ini

@@ -10,7 +10,7 @@
 # The file (and all resulting CI YAMLs) then need to be regenerated via
 # "scripts/generate-test-files.sh".
 #
-# Last generated: 2025-07-29T08:10:08.981379+00:00
+# Last generated: 2025-07-29T08:26:02.455474+00:00
 
 [tox]
 requires =
@@ -378,7 +378,7 @@ deps =
     httpx-v0.25: pytest-httpx==0.25.0
     httpx: pytest-httpx
     # anyio is a dep of httpx
-    httpx: anyio<4.0.0
+    httpx: anyio>=3,<5
     httpx-v0.16: httpx~=0.16.0
     httpx-v0.18: httpx~=0.18.0
     httpx-v0.20: httpx~=0.20.0