manifest: update sdk-mcuboot: brings improved UARTE clean-up

[nvlsianpu]

This update brings improved UARTE clean-up which now resets its Pins to the default state.

Ref.: NCSIDB-1194

[NordicBuilder]

The following west manifest projects have been modified in this Pull Request:

Name	Old Revision	New Revision	Diff
mcuboot	nrfconnect/[email protected]	nrfconnect/sdk-mcuboot#303	nrfconnect/sdk-mcuboot#303/files

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[NordicBuilder]

Test specification

CI/Jenkins/NRF

• Integration Platforms

CI/Jenkins/integration

Test Module	File based changes	Manually selected	West overwrite

Detailed information of selected test modules

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[NordicBuilder]

You can find the documentation preview for this PR at this link. It will be updated about 10 minutes after the documentation build succeeds.

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[github-actions]

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