Update to elastic/beats@18f4e405ad11 (7.x)

[axw]

Motivation/summary

Update beats to elastic/beats@18f4e405ad11, bringing in elastic/beats#25020

How to test these changes

1. Install apm-server (don't just make apm-server, this is a shortcut for development and does not build PIE)
2. Check the binary is PIE (see https://unix.stackexchange.com/questions/89211/how-to-test-whether-a-linux-binary-was-compiled-as-position-independent-code)

Related issues

#4960

[codecov-io]

Codecov Report

Merging #5086 (c45a9c3) into 7.x (e3dcaff) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              7.x    #5086   +/-   ##
=======================================
  Coverage   77.34%   77.34%           
=======================================
  Files         179      179           
  Lines       10540    10540           
=======================================
  Hits         8152     8152           
  Misses       2388     2388           

Impacted Files	Coverage Δ
...ack/apm-server/aggregation/txmetrics/aggregator.go	93.24% <0.00%> (ø)

[ghost]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #5086 updated

• Start Time: 2021-04-13T13:30:02.021+0000

• Duration: 41 min 33 sec

• Commit: 1f83e6a

Test stats 🧪

Test	Results
Failed	0
Passed	4796
Skipped	123
Total	4919

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