Update arm-none-eabi-gdb version to 15.2.1

[jthuangarm]

Fixes

• #840

Changes

• Updates the version of the arm-none-eabi-gdb dependency to 15.2.1 across the project

Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• 📖 Documentation updates are complete (if required).
• 🧠 Third-party dependencies and TPIP updated (if required).

[qltysh]

Coverage Impact

This PR will not change total coverage.

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[jreineckearm]

@omarArm , would you mind reviewing and merging if OK while I am away?

[omarArm]

Changes look solid. I tested it and it LGTM.

@JonatanAntoni could you please merge it? since I don't have the rights