Update dpvocab license info (#1250)

The license of [Data Privacy Vocabulary](https://github.com/w3c/dpv/)
(`dpvocab` here) is "W3C Software and Document license - 2023 version"
https://www.w3.org/copyright/software-license-2023/

SPDX License Identifier for `license` field in the record:
[`W3C-20150513`](https://spdx.org/licenses/W3C-20150513.html)

Ref: 
[1] License of Data Privacy Vocabulary:
https://github.com/w3c/dpv/blob/master/LICENSE.md
[2] Equivalence of `W3C-20150513` and the 2023 version of the license:
spdx/license-list-XML#2600 (comment)

---------

Signed-off-by: Arthit Suriyawongkul <arthit@gmail.com>

src/bioregistry/data/bioregistry.json

@@ -28721,12 +28721,19 @@
         "github": "nagutm",
         "name": "Mufaddal Naguthanawala",
         "orcid": "0009-0009-5240-7463"
+      },
+      {
+        "email": "arthit@gmail.com",
+        "github": "bact",
+        "name": "Arthit Suriyawongkul",
+        "orcid": "0000-0002-9698-1899"
       }
     ],
     "description": "The Data Privacy Vocabulary provides an ontology (classes and properties) and taxonomies of concepts to represent information regarding how personal data is processed in the form of an ontology or a knowledge graph.",
     "example": "Duration",
     "github_request_issue": 1241,
     "homepage": "https://w3c.github.io/dpv/2.0/dpv",
+    "license": "W3C-20150513",
     "name": "Data Privacy Vocabulary",
     "publications": [
       {
@@ -28740,6 +28747,9 @@
         "year": 2019
       }
     ],
+    "references": [
+      "https://github.com/biopragmatics/bioregistry/pull/1250"
+    ],
     "repository": "https://github.com/w3c/dpv",
     "reviewer": {
       "email": "cthoyt@gmail.com",