Syncronize mbed-ls minimum version with icetea requirements

[OPpuolitaival]

Description

Fix for: #8064

Root cause is that icetea, mbed-flasher requires newer mbed-ls than mbed-os and mbed-cli install requirements based on mbed-os requirements

Pull request type

[x] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Breaking change

[cmonr]

This is probably needed anyways, but looking at the issue, this doesn't appear to solve the problem.

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3068
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8075/

Triggering tests

/morph test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2680
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8075/

[cmonr]

Not sure this completely solves the problem according to the issue.

[OPpuolitaival]

Mbed tools are checking that mbed-os project requirements.txt related tools are installed when run some mbed-command. When we have this in here the check can see it. The check does not care about libraries dependencies and therefore issue was possible. @theotherjimmy can you confirm the analyse?

[adbridge]

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 2856
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8075/2856