Update changelog for release v43.13.0

[lcampos]

What does this PR do?

Updates the changelog for release v43.13.0

What issues does this PR fix or reference?

[codecov]

Codecov Report

Merging #591 into release/v43.13.0 will decrease coverage by 0.58%.
The diff coverage is n/a.

@@                 Coverage Diff                  @@
##           release/v43.13.0     #591      +/-   ##
====================================================
- Coverage             72.68%   72.09%   -0.59%     
====================================================
  Files                   155      155              
  Lines                  6157     6157              
  Branches                953      953              
====================================================
- Hits                   4475     4439      -36     
- Misses                 1443     1485      +42     
+ Partials                239      233       -6

Impacted Files	Coverage Δ
...kages/salesforcedx-vscode-apex/src/requirements.ts	27.5% <0%> (-35%)	⬇️
...code-apex/src/views/readableApexTestRunExecutor.ts	0% <0%> (-27.78%)	⬇️
...s/salesforcedx-vscode-apex/src/views/testRunner.ts	0% <0%> (-23.41%)	⬇️
...ges/salesforcedx-vscode-apex/src/languageServer.ts	40.74% <0%> (-11.12%)	⬇️

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[vazexqi]

Should we also put a link to the new section that @ruthemmanuelle just wrote yesterday (thanks again for that Ruth)?

[ruthemmanuelle]

Yeah, let's do that. After Emily reviews my PR I'll merge it and add a link here.

[vazexqi]

Approved from tech side. Ruth can comment on language.