bug: SMAIL-GPL causing validate to fail

👋 Sorry if this is being handled in another thread. I tried to find all coverage of current licenses issues and didn't see this one.

### Reproduction
You might need to modify the platform flag for your local on the below:
```
syft -o cyclonedx-json docker:nginx:latest | docker run -i --platform linux/amd64 cyclonedx/cyclonedx-cli:latest validate --input-format json

On instance: /components/12/licenses/2/license:
{"id":"SMAIL-GPL"}
Value should match one of the values specified by the enum
http://cyclonedx.org/schema/spdx.schema.json
On instance: /components/12/licenses/2/license/id:
SMAIL-GPL
Unable to validate against any JSON schemas.
BOM is not valid.
```

After removing the SMAIL-GPL License from the SBOM in component[12]:

```
cat new.json | docker run -i --platform linux/amd64 cyclonedx/cyclonedx-cli:latest validate --input-format json
BOM validated successfully.
```

I'm not sure which version of `http://cyclonedx.org/schema/spdx.schema.json` the validator is pulling from since I do see `SMAIL-GPL` included there. If this is fixed by doing a new release then no harm no foul I'll close the issue when the new release comes out 😄

Also. I did notice how this issue then caused a TON of noise above it. Here is the full output of the error:
```
On instance: /components/12/licenses:
[{"license":{"id":"GPL-2.0-only"}},{"license":{"id":"GPL-2.0-or-later"}},{"license":{"id":"SMAIL-GPL"}},{"license":{"name":"public-domain"}}]
Value should have at most 1 items
http://cyclonedx.org/schema/bom-1.6.schema.json#/oneOf/1

On instance: /components/12/licenses:
[{"license":{"id":"GPL-2.0-only"}},{"license":{"id":"GPL-2.0-or-later"}},{"license":{"id":"SMAIL-GPL"}},{"license":{"name":"public-domain"}}]
Required properties ["expression"] are not present
http://cyclonedx.org/schema/bom-1.6.schema.json#/oneOf/1/items/0

On instance: /components/12/licenses/0:
{"license":{"id":"GPL-2.0-only"}}
All values fail against the false schema
http://cyclonedx.org/schema/bom-1.6.schema.json#/oneOf/1/additionalItems

On instance: /components/12/licenses/1:
{"license":{"id":"GPL-2.0-or-later"}}
All values fail against the false schema
http://cyclonedx.org/schema/bom-1.6.schema.json#/oneOf/1/additionalItems

On instance: /components/12/licenses/2:
{"license":{"id":"SMAIL-GPL"}}
All values fail against the false schema
http://cyclonedx.org/schema/bom-1.6.schema.json#/oneOf/1/additionalItems

On instance: /components/12/licenses/3:
{"license":{"name":"public-domain"}}
All values fail against the false schema
http://cyclonedx.org/schema/bom-1.6.schema.json#/oneOf/1/items/0/additionalProperties

On instance: /components/12/licenses/0/license:
{"id":"GPL-2.0-only"}
Required properties ["name"] are not present
http://cyclonedx.org/schema/bom-1.6.schema.json#/oneOf/1

On instance: /components/12/licenses/2/license:
{"id":"SMAIL-GPL"}
Value should match one of the values specified by the enum
http://cyclonedx.org/schema/spdx.schema.json
On instance: /components/12/licenses/2/license/id:
SMAIL-GPL
Unable to validate against any JSON schemas.
BOM is not valid.
```

The logic basically keys on SMAIL-GPL not being a valid spdx-id, and then because of that it invalidates all other entries as failing against the schema for one reason or another ☹️ --- I think there might be some ways to clean this up, but defer to the maintainers here on what they think the best presentation of errors like this should be.