Remove sphinx pinning (#1507)

This pinning was needed for [historical reasons that are no longer relevant](rapidsai/cucim@5cbc80b).

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #1507

conda/environments/all_cuda-118_arch-x86_64.yaml

@@ -46,7 +46,7 @@ dependencies:
 - scikit-build-core>=0.10.0
 - scikit-image
 - shapely
-- sphinx<6
+- sphinx
 - sqlite
 - sysroot_linux-64==2.17
 name: all_cuda-118_arch-x86_64

conda/environments/all_cuda-125_arch-x86_64.yaml

@@ -48,7 +48,7 @@ dependencies:
 - scikit-build-core>=0.10.0
 - scikit-image
 - shapely
-- sphinx<6
+- sphinx
 - sqlite
 - sysroot_linux-64==2.17
 name: all_cuda-125_arch-x86_64

dependencies.yaml

@@ -353,7 +353,7 @@ dependencies:
           - numpydoc
           # https://github.com/pydata/pydata-sphinx-theme/issues/1539
           - pydata-sphinx-theme!=0.14.2
-          - sphinx<6
+          - sphinx
   notebooks:
     common:
       - output_types: [conda, requirements, pyproject]