Pin to nightly-2021-09-30

This works around this bug:
rust-lang/rust#89432

Signed-off-by: Nathaniel McCallum <[email protected]>

Author: npmccallum

.github/workflows/lint.yml

@@ -34,7 +34,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           components: clippy
-          toolchain: nightly
+          toolchain: nightly-2021-09-30
           profile: minimal
           target: x86_64-unknown-linux-musl
           override: true
@@ -64,7 +64,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           components: clippy
-          toolchain: nightly
+          toolchain: nightly-2021-09-30
           profile: minimal
           target: x86_64-unknown-linux-musl
           override: true

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           target: x86_64-unknown-linux-musl
-          toolchain: nightly
+          toolchain: nightly-2021-09-30
           override: true
       - uses: actions-rs/cargo@v1
         with:
@@ -39,7 +39,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           target: x86_64-unknown-linux-musl
-          toolchain: nightly
+          toolchain: nightly-2021-09-30
           override: true
       - run: cargo test ${{ matrix.profile.flag }}
         working-directory: internal/${{ matrix.crate }}

build.rs

@@ -231,7 +231,7 @@ fn main() {
             .envs(&filtered_env)
             .stdout(stdout)
             .stderr(stderr)
-            .arg("+nightly")
+            .arg("+nightly-2021-09-30")
             .arg("build")
             .args(profile)
             .arg("--target-dir")