Update dependency intersection-observer to v0.12.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
intersection-observer	0.5.0 -> 0.12.2

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Release Notes

GoogleChromeLabs/intersection-observer (intersection-observer)

v0.12.2

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[codecov]

Codecov Report

Merging #467 (99434ee) into master (edc7cc6) will not change coverage.
The diff coverage is n/a.

❗ Current head 99434ee differs from pull request most recent head 696a3a6. Consider uploading reports for the commit 696a3a6 to get more accurate results

@@           Coverage Diff           @@
##           master     #467   +/-   ##
=======================================
  Coverage   71.13%   71.13%           
=======================================
  Files         240      240           
  Lines        4320     4320           
  Branches      902      932   +30     
=======================================
  Hits         3073     3073           
  Misses       1124     1124           
  Partials      123      123           

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