ci: Update arm-none-eabi- version

[urutva]

Summary of changes

The arm-none-eabi- version is updated from version 6 to version 9.

Signed-off-by: Devaraj Ranganna devaraj.ranganna@arm.com

Impact of changes

Migration actions required

Documentation

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@urutva, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[0xc0170]

CI started

[mbed-ci]

Test run: FAILED

Summary: 1 of 10 test jobs failed
Build number : 1
Build artifacts

Failed test jobs:

• jenkins-ci/mbed-os-ci_greentea-test-lts

[0xc0170]

I restarted tests, networking issue

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To my understanding, this unblocks the PRs for 5.15 (other PRs for 5.15 are failing travis)