Recommended update for yast2-schema

This update for yast2-schema provides the following fixes:

- Update required version of yast2-bootloader to handle missing tags cpu_mitigations and smt in bootloader. (bsc#1128707)

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1128707
[Build 20190310] Element profile has extra content: add-on
Selected Binaries
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