Update srt to 1.5.7 from 1.5.6 - #1

buildx failed with: ERROR: failed to build: failed to solve: process "/bin/sh -c apk add --no-cache --virtual build build-base cmake pkgconf openssl-dev openssl-libs-static && cmake -G\"Unix Makefiles\" -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_SHARED=OFF -DENABLE_APPS=OFF -DENABLE_CXX11=ON -DUSE_STATIC_LIBSTDCXX=ON -DOPENSSL_USE_STATIC_LIBS=ON -DENABLE_LOGGING=OFF -DCMAKE_INSTALL_LIBDIR=lib -DCMAKE_INSTALL_INCLUDEDIR=include -DCMAKE_INSTALL_BINDIR=bin .. && make -j$(nproc) install && pkg-config --exists --modversion --path srt && ar -t /usr/local/lib/libsrt.a && readelf -h /usr/local/lib/libsrt.a && apk del build" did not complete successfully: exit code: 2