chore(deps): update qemux/qemu-arm docker tag to v2.15

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
qemux/qemu-arm	final	minor	2.14 -> 2.15

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Release Notes

qemus/qemu-arm (qemux/qemu-arm)

### [`v2.15`](https://redirect.github.com/qemus/qemu-arm/releases/tag/v2.15) [Compare Source](https://redirect.github.com/qemus/qemu-arm/compare/v2.14...v2.15) #### What's Changed - build: Pin Debian version by [@​kroese](https://redirect.github.com/kroese) in [https://github.com/qemus/qemu-arm/pull/139](https://redirect.github.com/qemus/qemu-arm/pull/139) **Full Changelog**: https://github.com/qemus/qemu-arm/compare/v2.14...v2.15

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