[RootFS] Add PlatformSupport entries for all platforms

[giordano]

Automatically generated with

using TOML
toml = TOML.parse(readchomp("Artifacts.toml"))
for (k, v) in filter(((k, v),) -> contains(k, r"^PlatformSupport.*2025\.2\.15") && !contains(k, "mingw"), toml)
    toml[replace(k, "2025.2.15" => "2025.8.13")] = v
end
open("Artifacts.toml", "w") do io
    TOML.print(io, toml; sorted=true)
end

This is a follow-up to #437.

Edit: it turned out the squashfs builds must have exactly the same names as artifact, I suspect that's because of

BinaryBuilderBase.jl/src/Rootfs.jl

Lines 62 to 79 in 4a8a029

	"""
	artifact_name(cs::CompilerShard)
	Return the bound artifact name for a particular shard.
	"""
	function artifact_name(cs::CompilerShard)
	target_str = ""
	if cs.target !== nothing
	target_str = "-$(triplet(cs.target::Platform))"
	if cs.name in ("GCCBootstrap", "PlatformSupport")
	# armv6l uses the same GCC shards as armv7l, so we just rename here.
	target_str = replace(target_str, "-armv6l-linux" => "-armv7l-linux")
	end
	end
	ext = Dict(:squashfs => "squashfs", :unpacked => "unpacked")[cs.archive_type]
	return "$(cs.name)$(target_str).v$(cs.version).$(triplet(cs.host)).$(ext)"
	end

, so the easier thing I managed to do was to just rebuild all of them (the alternative would have been to download old artifacts and reupload them, with updated names for all the tarballs).