Merge "Update workspace text shadow according to new specs." into sc-dev am: b1754bfc06 am: 25e6958e75

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14494140

Change-Id: Ic38e66683b60f456aa1b737725aa5c88a9fecc72