Regularize libmsquic installation: use distro-appropriate repos and update version

Co-authored-by: richlander <2608468+richlander@users.noreply.github.com>

Author: Copilot

src/almalinux/10/helix/amd64/Dockerfile

@@ -21,7 +21,7 @@ FROM library/almalinux:10
 RUN dnf upgrade --refresh -y \
     && dnf install --setopt tsflags=nodocs -y \
         dnf-plugins-core \
-    && dnf config-manager --add-repo=https://packages.microsoft.com/rhel/9/prod/config.repo \
+    && dnf config-manager --add-repo=https://packages.microsoft.com/rhel/10/prod/config.repo \
     && dnf install --setopt tsflags=nodocs -y --allowerasing \
         cpio \
         file \

src/almalinux/8/helix/amd64/Dockerfile

@@ -3,10 +3,7 @@ FROM library/almalinux:8
 RUN dnf upgrade --refresh -y \
     && dnf install --setopt tsflags=nodocs -y  \
         'dnf-command(config-manager)' \
-    # Add microsoft centos/8 repo for libmsquic.
-    # (Use centos/8 rather than rhel/8 because the latter doesn't have
-    #  libmsquic except in the 8.1-specific packages feed.)
-    && dnf config-manager --add-repo=https://packages.microsoft.com/centos/8/prod/config.repo \
+    && dnf config-manager --add-repo=https://packages.microsoft.com/rhel/8/prod/config.repo \
     && dnf install --setopt tsflags=nodocs -y \
         # Get recent python3 This is needed to get a pip recent enough
         # not to fail the build when installing cryptography library as

src/centos-stream/10/helix/Dockerfile

@@ -20,7 +20,7 @@ FROM quay.io/centos/centos:stream10
 RUN dnf upgrade --refresh -y \
     && dnf install --setopt tsflags=nodocs -y \
         dnf-plugins-core \
-    && dnf config-manager --add-repo=https://packages.microsoft.com/rhel/9/prod/config.repo \
+    && dnf config-manager --add-repo=https://packages.microsoft.com/rhel/10/prod/config.repo \
     && dnf install --setopt tsflags=nodocs -y --allowerasing \
         autoconf \
         automake \

src/ubuntu/26.04/helix/Dockerfile

@@ -21,7 +21,7 @@ RUN python3 -m venv /venv \
 
 FROM ubuntu.azurecr.io/ubuntu:26.04
 ARG TARGETARCH
-ARG LIBMSQUIC_VERSION=2.4.8
+ARG LIBMSQUIC_VERSION=2.5.6
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN LIBCURL=libcurl4 \