Add changelog for 18.3

[rickhanlonii]

Fixes #28924

[react-sizebot]

Comparing: c408361...8c49c91

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.66 kB	6.66 kB	=	1.82 kB	1.82 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.67 kB	6.67 kB	=	1.83 kB	1.83 kB
facebook-www/ReactDOM-prod.classic.js	=	591.11 kB	591.11 kB	=	103.94 kB	103.94 kB
facebook-www/ReactDOM-prod.modern.js	=	567.33 kB	567.33 kB	=	100.34 kB	100.34 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Generated by 🚫 dangerJS against 8c49c91

[Zaid-maker]

The tag and the release still missing on the Release Tab

[wojtekmaj]

The feeling when you missed adding an entry stating that you've added a missing changelog to a changelog and now you gotta release 18.3.2 adding changelog 💀

[rickhanlonii]

18.3.1 and 18.3.0 tags + releases published: https://github.com/facebook/react/releases