Fix 'gbk' codec can't encode character '\u200b' when resolve context

[loonghao]

This PR is try to fix #1507

[maxnbk]

The io.open / codecs switch causes the py2.7 tests to fail, presently. Could that be wrapped per version?

Something like?

from rez.vendor.six import six

# http://python3porting.com/problems.html#replacing-userdict
if six.PY2:
    import codecs.open as open
else:
    import io.open as open

# [...]

with open() # etc

[loonghao]

The io.open / codecs switch causes the py2.7 tests to fail, presently. Could that be wrapped per version?

Something like?

from rez.vendor.six import six

# http://python3porting.com/problems.html#replacing-userdict
if six.PY2:
    import codecs.open as open
else:
    import io.open as open

# [...]

with open() # etc

Test failed in CI same with this issues#1502

io.open should also work well in python-2.7, please let me know if there is anything else I missed, thanks.

Reference: https://code.activestate.com/lists/python-list/681909

I see the CI logs:
https://github.com/AcademySoftwareFoundation/rez/actions/runs/5499309914/jobs/10021427753?pr=1508#step:5:10110

@maxnbk I will update the MR, Thanks.

[loonghao]

@maxnbk I have already updated the PR. Please take your time to review it again and let me know if there is anything else that needs to be modified. Thank you.

[sonarcloud]

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[JeanChristopheMorinPerso]

Thank you @loonghao ! We merged your change and it should be released in the next release.