release: v0.7.0

[mniestroj]

Optional dependencies:

• [x] #413
• [x] bump Zephyr to tip of main (once again) to pull s/esp32/esp32_devkitc_wroom/ board rename

Closes: https://github.com/golioth/firmware-issue-tracker/issues/168

[github-actions[bot]]

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[sam-golioth]

Let's do one more rebase to pull in the PSK and cert generation script changes