Bump rust-toolchain and linked-list-allocator versions.

patches/libtock-rs/05-bigger_heap.patch

@@ -0,0 +1,13 @@
+diff --git a/src/entry_point.rs b/src/entry_point.rs
+index a24958c..e907e33 100644
+--- a/src/entry_point.rs
++++ b/src/entry_point.rs
+@@ -348,7 +348,7 @@ pub unsafe extern "C" fn rust_start(app_start: usize, stacktop: usize, app_heap_
+     // Heap size is set using `elf2tab` with `--app-heap` option, which is
+     // currently at 1024. If you change the `elf2tab` heap size, make sure to
+     // make the corresponding change here.
+-    const HEAP_SIZE: usize = 1024;
++    const HEAP_SIZE: usize = 90000;
+ 
+     // we could have also bss_end for app_heap_start
+     let app_heap_start = app_heap_break;