(treaty part actions): returns 404 when using lowercase part character

[ryparker]

When requesting actions for a treaty part that is lowercase, then a 404 response is returned

Example request:

curl --location 'https://api.congress.gov/v3/treaty/114/13/a/actions?format=json&api_key=<API_KEY>'

Response 404:

{
    "error": "No Treaty matches the given query.",
    "request": {
        "congress": "114",
        "contentType": "application/json",
        "format": "json"
    }
}

But if the part is capitalized (A), the response is successful:

curl --location 'https://api.congress.gov/v3/treaty/114/13/A/actions?format=json&api_key=<API_KEY>'

Response: 200

{
    "actions": [
        {
            "actionCode": "S05291",
            "actionDate": "2018-07-26",
            "committee": null,
            "text": "Resolution of advice and consent to ratification agreed to in Senate by Division Vote.",
            "type": "Floor"
        },
        {
            "actionCode": "S05311",
            "actionDate": "2018-07-26",
            "committee": null,
            "text": "Treaty moved through its parliamentary stages up to and including presentation of the resolution of advice and consent to ratification.",
            "type": "Floor"
        },
        {
            "actionCode": "S05120",
            "actionDate": "2016-12-09",
            "committee": {
                "name": "Foreign Relations Committee",
                "systemCode": "ssfr00",
                "url": "https://api.congress.gov/v3/committee/senate/ssfr00?format=json"
            },
            "text": "Received in the Senate and referred to the Committee on Foreign Relations by unanimous consent removing the injunction of secrecy.",
            "type": "IntroReferral"
        },
        {
            "actionCode": "S05220",
            "actionDate": "2018-07-26",
            "committee": null,
            "text": "Considered by Senate.",
            "type": "Floor"
        },
        {
            "actionCode": "S05153",
            "actionDate": "2018-05-15",
            "committee": {
                "name": "Foreign Relations Committee",
                "systemCode": "ssfr00",
                "url": "https://api.congress.gov/v3/committee/senate/ssfr00?format=json"
            },
            "text": "Reported by Senator Corker, Committee on Foreign Relations with printed Ex. Rept. 115-2 and a resolution of advice and consent to ratification with 1 declaration. Executive Calendar No. 2.",
            "type": "Committee"
        }
    ],
    "pagination": {
        "count": 5
    },
    "request": {
        "congress": "114",
        "contentType": "application/json",
        "format": "json"
    }
}

I had expected all apis to support lowercase urls as stated in the change log: https://github.com/LibraryOfCongress/api.congress.gov/blob/main/ChangeLog.md#change-3-13