Bump serialize-javascript and mocha in /fea-lsp/editors/vscode #3198

Job	Run time
Clippy lints	58s
Clippy lints	58s
fontbe tests	45s
fontbe tests	45s
Rustfmt	1m 3s
Rustfmt	56s
cargo check no std	57s
cargo check no std	59s
resources/scripts/ots_test.sh	54s
resources/scripts/ots_test.sh	53s
fontc tests	55s
fontc tests	1m 1s
tests other than fontbe,fontc	2m 4s
tests other than fontbe,fontc	2m 12s
Build GS and check the result	1m 48s
Build GS and check the result	1m 51s
cargo check wasm	1m 4s
cargo check wasm	1m 3s
cargo test fea-rs	1m 5s
cargo test fea-rs	54s
	23m 5s

Provide feedback