[expo-notifications] Require at least 5.1.1 which fixes Bundle serialization issue (#8151)
[expo-notifications] Require at least 5.1.1 which fixes Bundle serialization issue (#8151)

# Why

Several people have already bumped into a problem described in https://github.com/expo/expo/issues/8142#issuecomment-623718799.

# How

Published `@unimodules/core@5.1.1` with a fix, added an explicit dependency on `@unimodules/core` to `expo-notifications`.

# Test Plan

The fix contained in `5.1.1` has been confirmed by the community. An explicit dependency should make `expo-notifications` pull in newer version of `@unimodules/core` and the autoinstallation scripts should pick the greatest version to install.
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