Update changelog to 7.11

[simitt]

Update the 7.11 changelog in master for the upcoming release.

[bmorelli25]

Can you add include::./changelogs/7.11.asciidoc[] to https://github.com/elastic/apm-server/blame/master/CHANGELOG.asciidoc as well please.

[codecov-io]

Codecov Report

Merging #4561 (5012846) into master (d8792d8) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4561      +/-   ##
==========================================
+ Coverage   75.89%   75.96%   +0.07%     
==========================================
  Files         161      161              
  Lines        9789     9789              
==========================================
+ Hits         7429     7436       +7     
+ Misses       2360     2353       -7     

Impacted Files	Coverage Δ
...ack/apm-server/aggregation/txmetrics/aggregator.go	93.36% <0.00%> (ø)
processor/otel/consumer.go	93.95% <0.00%> (+0.44%)	⬆️
kibana/connecting_client.go	70.17% <0.00%> (+8.77%)	⬆️

[apmmachine]

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Build stats

• Build Cause: Pull request #4561 updated

• Start Time: 2020-12-28T07:31:45.444+0000

• Duration: 57 min 58 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4613
Skipped	124
Total	4737

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• Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

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• Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

[bmorelli25]

Thanks!