[Dependabot]: Bump neorv32 from `3e48992` to `21436a8` #938

Job	Run time
Matrix	3s
🛳️ All-in-one \| UPDuino-v3.0 · MinimalBoot	1m 14s
🛳️ All-in-one \| UPDuino-v3.0 · UP5KDemo	2m 40s
🛳️ All-in-one \| Fomu · Minimal	1m 14s
🛳️ All-in-one \| Fomu · MinimalBoot	1m 18s
🛳️ All-in-one \| Fomu · MixedLanguage	1m 15s
🛳️ All-in-one \| Fomu · UP5KDemo	1m 39s
🛳️ All-in-one \| iCEBreaker · MinimalBoot	1m 8s
🛳️ All-in-one \| iCEBreaker · UP5KDemo	2m 5s
🛳️ All-in-one \| iCESugar-v1.5 · Minimal	1m 8s
🛳️ All-in-one \| iCESugar-v1.5 · MinimalBoot	1m 13s
🛳️ All-in-one \| OrangeCrab · MinimalBoot	1m 6s
🛳️ All-in-one \| IceZumAlhambraII · MinimalBoot	1m 16s
🛳️ All-in-one \| ULX3S · MinimalBoot	1m 4s
🛳️ All-in-one \| iCE40CW312 · MinimalBoot	1m 8s
	19m 31s

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