fix: GHA warnings

[anujkum3]

Update versions of below reusable actions:

• docker/setup-qemu-action@v3
• docker/setup-buildx-action@v3

Update will fix below Warnings:

• build-and-pushThe set-output command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
• build-and-pushThe save-state command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands

Detailed warnings can be found https://github.com/loft-sh/devpod/actions/runs/12953268154