Paginated v3 API responses return `http://` next/previous links on the public instance

Hi!

Not sure if this is the correct place to report this as it might be an infrastructure configuration issue, but when making queries to the paginated endpoints like `v3/advisories` or `v3/packages` on https://public.vulnerablecode.io, the "next" and "previous" fields in the response have URLs like

```json
"next": "http://public.vulnerablecode.io/api/v3/advisories/?page=3"
"previous": "http://public.vulnerablecode.io/api/v3/advisories",
```

for example, instead of `https`.

Reproduce:

```
curl -X POST "https://public.vulnerablecode.io/api/v3/advisories/" \
-H "Content-Type: application/json" \
-H "User-Agent: VCIO_API_AGENT" \
-d '{
"purls": [
"pkg:npm/%40angular/common@16.2.12",
"pkg:npm/%40angular/compiler@16.2.12",
"pkg:npm/%40angular/core@16.2.12",
"pkg:npm/%40angular/platform-server@16.2.12",
"pkg:npm/acorn@2.7.0",
"pkg:npm/brace-expansion@1.1.8",
"pkg:npm/echarts@6.0.0",
"pkg:npm/esbuild@0.27.2",
"pkg:npm/jsdom@9.5.0",
"pkg:npm/lodash@4.17.21",
"pkg:npm/minimatch@3.0.5",
"pkg:npm/qs@6.5.5",
"pkg:npm/request@2.88.2",
"pkg:npm/tar@6.2.1",
"pkg:npm/tough-cookie@2.5.0",
"pkg:npm/uuid@3.4.0",
"pkg:maven/ch.qos.logback/logback-core@1.3.14",
"pkg:maven/com.fasterxml.jackson.core/jackson-core@2.14.3",
"pkg:maven/com.fasterxml.jackson.core/jackson-databind@2.14.3"
]
}' \
| jq -r '.next'
```

returns `http://public.vulnerablecode.io/api/v3/advisories/?page=2`