check.yml: fix cvt2utf not found sync with nuttx repository

[simbit18]

Summary

• This PR add missing cvt2utf installation on our CI
  see CI checkpatch: fix cvt2utf not found and add check of all necessary tools nuttx#16561

Impact

Impact on user: NO

Impact on build: NO

Impact on hardware: NO

Impact on documentation: NO

Impact on security: NO

Impact on compatibility: NO

Testing

CI

[simbit18]

The error is not about this PR !

====================================================================================
Configuration/Tool: imxrt1064-evk/mcuboot-loader,CONFIG_ARM_TOOLCHAIN_GNU_EABI
2025-06-23 11:06:45
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Building NuttX...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100   190  100   190    0     0   1835      0 --:--:-- --:--:-- --:--:--  1844

gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now
make[3]: *** [Makefile:86: mcuboot] Error 2
make[3]: Target 'context' not remade because of errors.
make[2]: *** [Makefile:57: /github/workspace/sources/apps/boot/mcuboot_context] Error 2
make[2]: Target 'context_all' not remade because of errors.
make[1]: *** [Makefile:187: context] Error 2
make: *** [tools/Unix.mk:458: /github/workspace/sources/apps/.context] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 385: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory
  [1/1] Normalize imxrt1064-evk/mcuboot-loader
====================================================================================

[cederom]

Hello world :-) I am back, restarted the CI :-) The source commit built and merged fine, lets see about this one :-)