Unpin nightly toolchain

mmarx · mmarx · commit cb7cf5d04da4 · 2023-06-20T21:24:47.000+02:00
With rust-lang/rust#112831 fixed, we can unpin the nightly toolchain again
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2023-06-19"
+channel = "nightly"
 components = [ "rustfmt", "clippy", "rust-docs", "miri" ]
