Even after changing the player skin customization URL, the skin fails to load properly and defaults to Steve.

[rororororo5]

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Issue Description: Dynmap sample issue description. This description would include as much and as little detail necessary for us to understand the issue in its entirety.

• Dynmap Version: Dynmap® v3.7-beta-10
• Server Version: PaperMC 1.21.7 build 32
• Pastebin of Configuration.txt: https://pastebin.com/Ssp3Jwut
• Server Host (if applicable):
• Pastebin of crashlogs or other relevant logs:
• Other Relevant Data/Screenshots:

• Steps to Replicate: Please be clear in this section so we can replicate your issue
• Procedure

1. Change the “Customize URL used for fetching player skins” entry in the config file to “https://mc-heads.net/skin/%uuid%”.
2. Start the server with Dynmap installed.
3. For some reason, only Steve icons are displayed for players.

(Note: This skin fetch URL worked without issues for a long time until very recently. Did Dynmap make any internal system changes?)

[ ] I have looked at all other issues and this is not a duplicate
[ ] I have been able to replicate this