Bump nightly version -> 2021-10-21

flip1995 · flip1995 · commit 8e48333bf192 · 2021-10-21T12:19:46.000+02:00
diff --git a/rust-toolchain b/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-10-07"
+channel = "nightly-2021-10-21"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src"]
