deps: Use '===' instead of '=='

[ghost]

To use '===' instead of '==' in union, because all the other js files are using '===' for the strict equal comparation.

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

[tniessen]

Thank you, @Maledong! We usually do not touch files in deps/ unless we are cherry-picking upstream changes or need to adapt the dependency to the requirements of Node.js.

You can suggest this change to the respective upstream repositories, but there are people who prefer to use == with typeof since both sides are guaranteed to be of the same type.

Also, please do not capitalize the verb in your commit messages as already noted in #22858 (comment).

[ghost]

OK, thanks!