DotVVM 4.3.15 security patch
Fixes security issues: GHSA-2rm3-333w-xvc4, GHSA-c8qj-jx8j-fg2w, GHSA-c2g3-c4gc-w5wg
Note that this changes the network protocol of FileUpload component – DotVVM now requires a token generated by FileUpload to allow users to upload files