add upper pin to jsonschema

jsonschema 4.18 will introduce changes that are incompatible
with asdf. More details can be found in:
#1485
this commit adds an upper pin to jsoncschema and removes
it from the devdeps testing
an issue was created to track removal of the pin:
#1486

CHANGES.rst

@@ -43,6 +43,7 @@ The ASDF Standard is at v1.6.0
 - Deprecate asdf.tests.helpers [#1440]
 - respect umask when determining file permissions for written files [#1451]
 - rename master branch to main [#1479]
+- require jsonschema<4.18 [#1487]
 
 2.14.3 (2022-12-15)
 -------------------

pyproject.toml

@@ -25,7 +25,7 @@ dependencies = [
   "importlib-metadata>=4.11.4",
   'importlib_resources>=3; python_version < "3.9"',
   "jmespath>=0.6.2",
-  "jsonschema>=4.0.1",
+  "jsonschema<4.18,>=4.0.1", # jsonschema 4.18 contains incompatible changes: https://github.com/asdf-format/asdf/issues/1485
   "numpy>=1.20",
   'numpy<1.25,>=1.20; python_version < "3.9"',
   "packaging>=19",

requirements-dev.txt

@@ -7,7 +7,8 @@ git+https://github.com/asdf-format/asdf-wcs-schemas
 git+https://github.com/astropy/astropy
 git+https://github.com/spacetelescope/gwcs
 git+https://github.com/yaml/pyyaml.git
-git+https://github.com/python-jsonschema/jsonschema
+# jsonschema 4.18 contains incompatible changes: https://github.com/asdf-format/asdf/issues/1485
+#git+https://github.com/python-jsonschema/jsonschema
 
 scipy>=0.0.dev0
 numpy>=0.0.dev0 ; python_version > "3.8"