doc: Updated sysutils/intel-microcode-netbsd to 20220419.

Update intel-microcode-netbsd to 20220419.

### Purpose

- Update for functional issues. Refer to errata APLI-11 in
  [Intel Atom Processor E3900 Series]
  (https://cdrdv2.intel.com/v1/dl/getContent/612204) for details.

### Updated Platforms

| Processor      | Stepping | F-M-S/PI    | Old Ver  | New Ver  | Products
|:---------------|:---------|:------------|:---------|:---------|:---------
| APL            | E0      | 06-5c-0a/03 | 00000024 | 00000028 | Atom x5-E39xx

(msaitoh)