fix(@ngtools/webpack): add Webpack 5 to peer dependencies

[valorkin]

Very minor addition to #18820
adding optional webpack@5 to peer dependencies of ngtools/webpack

[alan-agius4]

Webpack version 5 is not yet stable thus the semver version here is invalid. It should be ^5.0.0-rc.0.

Chiming in @clydin just to confirm whether we should add this peerDependencies in the first place since Webpack 5 support is still experimental, and adding Webpack 5 might send out the wrong message.

[alan-agius4]

PS: chore is an invalid commit message type. You can use fix for this.

fix(@ngtools/webpack): add Webpack 5 to peer dependencies

[valorkin]

I know, just made it the same way as it appears in all other occurrences. I can change those to rc.0 too

[valorkin]

all comments applied

[clydin]

Thank you for the contribution.
However, this has been superseded by #20037.

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