[Version] Bump to latest Chrome version with COOP/COEP support

[Tr4mper]

Thanks for the nice repository!

I tried using the JS/WASM implementation with a more recent version of Chrome (Version 90.0.4430.93 (Official Build) (64-bit)) and created this PR for others that might want to test it on recent and coming versions.

Changes: There was a syntax error in the verify_addr.sh script due to an additional ". Maybe the output changed with releases? Please correct me, if the error was on my side, but it also occured to me with the latest beta version of Chrome.

./verify_addr.sh: line 53: 0x000028d6ca230000+ 8128": syntax error: invalid arithmetic operator (error token is """)
./verify_addr.sh: line 56: 0x000028d6ca230000+101932992": syntax error: invalid arithmetic operator (error token is """)

Additionally, the --experimental-wasm-bigint flag is not longer needed, as the feature should now be enabled by default. As cross-origin isolation will become mandatory soon in Chrome and already is mandatory in Firefox (more information here), I extended the simple Python HTTP server to also send along the necessary headers for testing purposes.

Hope this is useful to somebody! Kind regards