build: specify exact nightly version everywhere

Author: JarvisCraft

.github/workflows/clippy_check.yml

@@ -7,7 +7,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-            toolchain: nightly
+            toolchain: nightly-2023-10-28
             components: clippy
             override: true
       - uses: actions-rs/clippy-check@v1

flake.nix

@@ -25,7 +25,7 @@
         lib = pkgs.lib;
         rust =
           (pkgs.rustChannelOf {
-            date = "2023-08-02";
+            date = "2023-10-28";
             channel = "nightly";
           })
           .default