MNT: Unpin maxversion of ipywidgets now that voila 0.4 is out, minver…

…sion ipywidgets now 8 (#1788)

* MNT: Unpin maxversion of ipywidgets
now that voila 0.4 is out. In fact, we pin
minversion ipywidgets to its new release.

Also bump pin for sidecar to they are all compatible.

* Ignore Widget deprecation warning

* Unpin ipykernel maxversion
that was pinned in #1937

setup.cfg

@@ -27,13 +27,13 @@ install_requires =
  glue-core>=1.6.0
  glue-jupyter>=0.15.0
  echo>=0.5.0
- ipykernel<6.18
+ ipykernel>=6.19.4
  ipyvue>=1.6
  ipyvuetify>=1.7.0
  ipysplitpanes>=0.1.0
  ipygoldenlayout>=0.3.0
- ipywidgets<8.0
- voila>=0.3.5,<0.4
+ ipywidgets>=8
+ voila>=0.4
  pyyaml>=5.4.1
  specutils>=1.9
  specreduce>=1.3.0,<1.4.0
@@ -47,7 +47,7 @@ install_requires =
  gwcs>=0.16.1
  regions>=0.6
  scikit-image
- sidecar>=0.5.1
+ sidecar>=0.5.2
  ipypopout>=0.0.11
  astroquery
 
@@ -96,6 +96,7 @@ filterwarnings =
  ignore:distutils Version classes are deprecated:DeprecationWarning
  ignore:Passing unrecognized arguments to super:DeprecationWarning
  ignore:.*With traitlets 4\.1, metadata should be set using the \.tag\(\) method:DeprecationWarning
+ ignore:Widget.* is deprecated:DeprecationWarning
  ignore:.*np\.bool8.*is a deprecated alias for:DeprecationWarning
  ignore:.*np\.uint0.*is a deprecated alias for:DeprecationWarning
  ignore:.*np\.int0.*is a deprecated alias for:DeprecationWarning