Replace use of deprecated decode encode string

[graingert]

Contributor Checklist:

• [x] I have updated the release notes at docs/source/NEWS.rst
• [ ] I have updated the automated tests.
• [ ] All tests pass on your local dev environment. See CONTRIBUTING.rst.

[graingert]

these are actually removed on py3.9 so need to go! Probably worth doing a release after this one

[codecov[bot]]

Codecov Report

Merging #211 into master will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #211      +/-   ##
==========================================
- Coverage   83.30%   83.30%   -0.01%     
==========================================
  Files          87       87              
  Lines       11570    11569       -1     
  Branches     1184     1184              
==========================================
- Hits         9638     9637       -1     
  Misses       1815     1815              
  Partials      117      117              

Impacted Files	Coverage Δ
ldaptor/entry.py	95.02% <ø> (ø)
ldaptor/protocols/ldap/ldif.py	100.00% <ø> (ø)
ldaptor/protocols/ldap/ldifprotocol.py	98.95% <ø> (ø)
ldaptor/test/test_ldif.py	100.00% <ø> (ø)
ldaptor/test/test_server.py	100.00% <ø> (ø)

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[graingert]

merging this now, will decide on the changelog at the next release - eg if twisted does ship a 3.9 supporting build before we do

[adiroiban]

I guess that ldaptor can have a release with support 3.9 before Twisted.

As long as the tests are green on Python 3.9 it means that ldaptor is ready for 3.9. I don't see why ldaptor should be blocked waiting for a Twisted release.

So if #210 is green I think it can be merged and if someone wants to run ldaptor on 3.9 we can also have a new release.