bump rust-installer submodule

pietroalbini · pietroalbini · commit c482ffd1a330 · 2020-12-28T12:48:11.000+01:00
diff --git a/src/tools/rust-installer b/src/tools/rust-installer
@@ -1 +1 @@
-Subproject commit d66f476b4d5e7fdf1ec215c9ac16c923dc292324
+Subproject commit 5254dbfd25d5284728ab624dca1969d61427a0db
