Rollup merge of rust-lang#57292 - ehuss:update-beta-cargo, r=nikomatsakis

pietroalbini · pietroalbini · commit 4c1812ba57b9 · 2019-01-04T00:19:40.000+01:00
diff --git a/src/tools/cargo b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 1b6702f22a0dd54847684f29acd6617dd31a8479
+Subproject commit 8610973aaf48615ba7dc9a38a9a2795ba6f36a31
