feat: update arm-gnu toolchain

Author: rjaegers

.devcontainer/cpp/Dockerfile

@@ -61,13 +61,13 @@ RUN --mount=from=downloader,target=/dl \
     --mount=type=cache,target=/var/lib/apt,sharing=locked <<EOF
     apt-get update && apt-get install --no-install-recommends -y minisign
 
-    ARM_GNU_TOOLCHAIN_URL="https://developer.arm.com/-/media/Files/downloads/gnu/14.2.rel1/binrel/arm-gnu-toolchain-14.2.rel1-$(uname -m)-arm-none-eabi.tar.xz"
+    ARM_GNU_TOOLCHAIN_URL="https://developer.arm.com/-/media/Files/downloads/gnu/15.2.rel1/binrel/arm-gnu-toolchain-15.2.rel1-$(uname -m)-arm-none-eabi.tar.xz"
     ARM_GNU_TOOLCHAIN_TAR="/tmp/arm-gnu-toolchain.tar.xz"
 
     if [[ "$(uname -m)" == "x86_64" ]]; then
-        ARM_GNU_TOOLCHAIN_SHA256="62a63b981fe391a9cbad7ef51b17e49aeaa3e7b0d029b36ca1e9c3b2a9b78823"
+        ARM_GNU_TOOLCHAIN_SHA256="597893282ac8c6ab1a4073977f2362990184599643b4c5ee34870a8215783a16"
     elif [[ "$(uname -m)" == "aarch64" ]]; then
-        ARM_GNU_TOOLCHAIN_SHA256="87330bab085dd8749d4ed0ad633674b9dc48b237b61069e3b481abd364d0a684"
+        ARM_GNU_TOOLCHAIN_SHA256="d061559d814b205ed30c5b7c577c03317ec447ca51cd5a159d26b12a5bbeb20c"
     fi
 
     wget --no-hsts -qO "${ARM_GNU_TOOLCHAIN_TAR}" "${ARM_GNU_TOOLCHAIN_URL}"