Replace abandoned pymp4 with my fork of pymp4

My fork contains various fixes by beardypig and truedread that do not have a release on PyPI yet.

pyproject.toml

@@ -38,13 +38,13 @@ pycaption = "^2.1.1"
 pycryptodomex = "^3.17.0"
 pyjwt = "^2.6.0"
 pymediainfo = "^6.0.1"
-pymp4 = "^1.2.0"
 pymysql = "^1.0.2"
 pywidevine = { extras = ["serve"], version = "^1.6.0" }
 PyYAML = "^6.0"
 requests = { extras = ["socks"], version = "^2.28.2" }
 rich = "^13.3.1"
 "rlaphoenix.m3u8" = "^3.4.0"
+rlaphoenix-pymp4 = "^1.5.0"
 "ruamel.yaml" = "^0.17.21"
 sortedcontainers = "^2.4.0"
 subtitle-filter = "^1.4.4"