west.yml: MCUboot synchronization from upstream

[nordicjm]

Update Zephyr fork of MCUboot to revision:
b192716c969ad358bb3a1db60c898212f3275c55

Brings following Zephyr relevant fixes:

• b192716c Revert "loader: Allow to specify slot number in version"
• 5b7bccf9 boot: bootutil: swap_offset: Fix not including unprotected TLVs
• ee9efe01 bootutil: Replace boot_write_enc_key with boot_write_enc_keys
• 80a39c64 bootutil: Replace literal slot indexes with identifiers

Notes on process:

1. The MCUboot update from mcu-tools/mcuboot/main with the SHA used in west.yaml is already synchronized to zephyrproject-rtos/mcuboot/upstream-sync branch, and is available in the Zephyr fork of MCUboot.
2. The [DNM] on this PR should be kept until the PR passes all tests and is accepted.
3. Once the PR passes all tests and gets accepted, the upstream-sync branch should be fast-forward merged to zephyrproject-rtos/mcuboot/main branch and [DNM] should be removed.
4. After the main branch gets updated, this PR does not require further changes and should be merged as is.

[github-actions]

The following west manifest projects have changed revision in this Pull Request:

Name	Old Revision	New Revision	Diff
mcuboot	zephyrproject-rtos/mcuboot@48b0f6d (main)	zephyrproject-rtos/mcuboot@b192716 (upstream-sync)	zephyrproject-rtos/[email protected]

✅ All manifest checks OK

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[nordicjm]

Dropping absent maintainer as also maintaining MCUboot