fix:Fixing webpack5 cache invalidation

[yicheny]

Currently, webpack5 caching is not working

If the cache was in effect, it would generate files with a '.pack' suffix, like ：

And now, the generated result looks like this：

The reason is that 'compiler.close()' is not called

webpack will generate the cache in 'compiler.close()'

Run 'npm run build' to verify the effect

has a huge impact on compilation speed in a project

[melloware]

This should absolutely be accepted.

[Crypto555top]

Thanks you're the best friend ever! Happy New Year #bitcoinluis Crypto. 1/8/2023

[Crypto555top]

God is there to help us thank goodness #bitcoinluis #bitcoin

[hunter2009]

Can anyone handle this issue?
According to webpack doc, it's necessary to close the comliper after running it:
Don't forget to close the compiler, so that low-priority work (like persistent caching) have the opportunity to complete.