SBOM Validation not checking iri-reference

Hello!

While using this tool to validate SBOM to be uploaded to DT (v4.12 & v4.13), DT seems to always refuse them due to
`$.components[XX].externalReferences[1].url: does not match the iri-reference pattern must be a valid RFC 3987 IRI-reference`

Which seems related to https://github.com/DependencyTrack/dependency-track/discussions/3775.

Example with the file:
```shell
Welcome to the sbom-utility! Version 'v0.17.1' (sbom-utility) (windows/amd64)
=============================================================================
[INFO] Loading (embedded) default schema config file: 'config.json'...
[INFO] Loading (embedded) default license policy file: 'license.json'...
[INFO] Attempting to load and unmarshal data from: 'bom.json'...
[INFO] Successfully unmarshalled data from: 'bom.json'
[INFO] Determining file's BOM format and version...
[INFO] Determined BOM format, version (variant): 'CycloneDX', '1.4' (latest)
[INFO] Matching BOM schema (for validation): schema/cyclonedx/1.4/bom-1.4.schema.json
[INFO] Loading schema 'schema/cyclonedx/1.4/bom-1.4.schema.json'...
[INFO] Found schema dependencies: [jsf-0.82.schema.json spdx.schema.json]
[INFO] Added schema 'schema/cyclonedx/common/jsf-0.82.schema.json' to loader:...
[INFO] Added schema 'schema/cyclonedx/common/spdx.schema.json' to loader:...
[INFO] Compiling schema: 'schema/cyclonedx/1.4/bom-1.4.schema.json'...
[INFO] Schema 'schema/cyclonedx/1.4/bom-1.4.schema.json' loaded
[INFO] Validating 'bom.json'...
[INFO] BOM valid against JSON schema: 'true'
```

Output from DT v4.13:
```json
{
"status": 400,
"title": "The uploaded BOM is invalid",
"detail": "Schema validation failed",
"errors": [
"$.components[17].externalReferences[1].url: does not match the iri-reference pattern must be a valid RFC 3987 IRI-reference",
"$.components[20].externalReferences[0].url: does not match the iri-reference pattern must be a valid RFC 3987 IRI-reference",
"$.components[21].externalReferences[0].url: does not match the iri-reference pattern must be a valid RFC 3987 IRI-reference",
"$.components[42].externalReferences[1].url: does not match the iri-reference pattern must be a valid RFC 3987 IRI-reference"
]
}
```

Part of the json sbom file failing, created from CycloneDX-net 5.2.0.0:
```json
{
"type": "library",
"bom-ref": "pkg:nuget/Dapper@2.0.35",
"name": "Dapper",
"version": "2.0.35",
"description": "A high performance Micro-ORM supporting SQL Server, MySQL, Sqlite, SqlCE, Firebird etc..",
"scope": "required",
"hashes": [
{
"alg": "SHA-512",
"content": "E4E458FBDCF993F654704D916C40CC4FD6F040D952B8DF771141762FAB684022A711C9EBCF9290EA3DB83E0AC26A4CC896CC22F969E9A74F04BBD9E4C110236D"
}
],
"licenses": [
{
"license": {
"id": "Apache-2.0"
}
}
],
"copyright": "2019 Stack Exchange, Inc.",
"purl": "pkg:nuget/Dapper@2.0.35",
"externalReferences": [
{
"url": "https://github.com/StackExchange/Dapper",
"type": "website"
},
{
"url": "https://github.com/StackExchange/Dapper",
"type": "vcs"
}
]
}
```