Revert "Temporarily pin toolchain to nightly-2022-02-09" due to night…

…ly fixes

This reverts commit 92b4cfb.

Rust nightly fixed by rust-lang/rust#93892 (comment)

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly-2022-02-09
+          toolchain: nightly
           override: true
 
       - name: Run cargo check
@@ -60,7 +60,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly-2022-02-09
+          toolchain: nightly
           override: true
           components: rustfmt
 
@@ -82,7 +82,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly-2022-02-09
+          toolchain: nightly
           override: true
           components: rustfmt, clippy
 
@@ -113,7 +113,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly-2022-02-09
+          toolchain: nightly
           override: true
 
       - name: Run cargo doc
@@ -169,7 +169,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly-2022-02-09
+          toolchain: nightly
           override: true
 
       - name: Checkout gh-pages