Update dependency symfony/webpack-encore-bundle to v2.2.0

This MR contains the following updates:

Package	Type	Update	Change
symfony/webpack-encore-bundle	require	minor	2.1.1 -> 2.2.0

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Release Notes

symfony/webpack-encore-bundle (symfony/webpack-encore-bundle)

v2.2.0

Compare Source

• #​236 Allow entrypoints.json to be hosted remotely (@​rlvdx & @​Kocal)
• #​232 fix: correctly wire the build-time file into kernel.build_dir (@​dkarlovi)
• #​237 Fix missing integrity hash on preload (@​arnaud-ritti & @​Kocal)

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