Update StyleX packages to 0.18.3

[martinbooth]

closes #476

[github-actions]

workflow: benchmarks/size

Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.

Results	Base	Patch	Ratio
react-strict-dom/dist/web/index.js
· compressed	3,251	3,251	1.00
· minified	10,375	10,375	1.00
react-strict-dom/dist/web/runtime.js
· compressed	1,645	1,645	1.00
· minified	4,131	4,131	1.00
react-strict-dom/dist/native/index.js
· compressed	16,705	16,705	1.00
· minified	64,818	64,818	1.00
react-strict-animated/dist/web/index.js
· compressed	6,861	6,861	1.00
· minified	23,486	23,486	1.00
react-strict-animated/dist/native/index.js
· compressed	797	797	1.00
· minified	2,518	2,518	1.00

[github-actions]

workflow: benchmarks/perf (native)

Comparison of performance test results, measured in operations per second. Larger is better.

Results	Base	Patch	Ratio
css.create
· small	1,492,330	1,502,417	1.01	+
· small with units	659,031	675,789	1.03	+
· small with variables	879,377	892,161	1.01	+
· several small	470,550	476,095	1.01	+
· large	275,291	275,671	1.00	+
· large with polyfills	206,385	207,531	1.01	+
· complex	143,510	145,531	1.01	+
· unsupported	278,477	287,902	1.03	+
css.createTheme
· simple theme	315,864	314,161	0.99	-
· polyfill theme	300,883	299,775	1.00	-