third_party/chrony: fix chrony source

The Git snapshot download currently returns a 500 status code.
Download the official release instead.

Change-Id: I673584ec2ea6152ca7338bd3609d2264d31b69bd
Reviewed-on: https://review.monogon.dev/c/monogon/+/1928
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/third_party/chrony/external.bzl b/third_party/chrony/external.bzl
index 64b4f47..f28a427 100644
--- a/third_party/chrony/external.bzl
+++ b/third_party/chrony/external.bzl
@@ -22,7 +22,7 @@
 
     http_archive(
         name = name,
-        sha256 = "61a1b0879432695735a1e2a14e5d1ae499d3be15099c767501fbe695f46861da",
+        sha256 = "ed76f2d3f9347ac6221a91ad4bd553dd0565ac188cd7490d0801d08f7171164c",
         build_file = "@//third_party/chrony:chrony.bzl",
         strip_prefix = "chrony-" + version,
         patch_args = ["-p1"],
@@ -30,5 +30,5 @@
             "//third_party/chrony/patches:disable_defaults.patch",
             "//third_party/chrony/patches:support_fixed_uids.patch",
         ],
-        urls = ["https://git.tuxfamily.org/chrony/chrony.git/snapshot/chrony-%s.tar.gz" % version],
+        urls = ["https://download.tuxfamily.org/chrony/chrony-%s.tar.gz" % version],
     )