ci: pin Rust to 1.81 for wasm32-unknown-unknown tests (#3125)

There is an incompatibility with the version of Node available on our
test runners and wasm32 in Rust 1.82 (#3123).

To unblock the CI, this change pins Rust to 1.81 for the tests using the
`wasm32-unknown-unknown` target. This is the same strategy used in Tokio
to mitigate tokio-rs/tokio#6910 until a more permanent fix can be put in
place.

This change also bumps the MSRV on the `tracing-examples` crate from
1.63.0 to 1.64.0 to avoid triggering a lint about the MSRV after a
change in Tokio 1.41.0 which bumps the required Rust version for the
`try_join!` macro. The Tokio MSRV is 1.70 now, so needing this bump for
the examples seems reasonable.

.github/workflows/CI.yml

@@ -35,7 +35,7 @@ jobs:
     name: cargo check
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
     - name: Check
       run: cargo check --all --tests --benches
@@ -46,7 +46,7 @@ jobs:
     needs: check
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
       with:
         components: rustfmt
@@ -58,7 +58,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: check
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
       with:
         components: clippy
@@ -88,7 +88,7 @@ jobs:
         - tracing
         - tracing-subscriber
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
     - name: install cargo-hack
       uses: taiki-e/install-action@cargo-hack
@@ -146,7 +146,7 @@ jobs:
         - 1.63.0
         - stable
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: install Rust nightly
       uses: dtolnay/rust-toolchain@nightly
     - name: "install Rust ${{ matrix.toolchain }}"
@@ -210,7 +210,7 @@ jobs:
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: "install Rust ${{ matrix.rust }}"
       uses: dtolnay/rust-toolchain@master
       with:
@@ -252,7 +252,7 @@ jobs:
         - tracing-tower
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
       with:
         target: wasm32-unknown-unknown
@@ -268,9 +268,11 @@ jobs:
         subcrate:
         - tracing
     steps:
-    - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@stable
+    - uses: actions/checkout@v4
+    - name: Install Rust 1.81
+      uses: dtolnay/rust-toolchain@stable
       with:
+        toolchain: 1.81
         target: wasm32-unknown-unknown
     - name: install test runner for wasm
       uses: taiki-e/install-action@wasm-pack
@@ -283,7 +285,7 @@ jobs:
     needs: check
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
     - name: "Test log support"
       run: cargo test
@@ -315,4 +317,4 @@ jobs:
       - test-wasm
       - test-features-stable
     steps:
-      - run: exit 0
+      - run: exit 0

examples/Cargo.toml

@@ -3,7 +3,7 @@ name = "tracing-examples"
 version = "0.0.0"
 publish = false
 edition = "2018"
-rust-version = "1.63.0"
+rust-version = "1.64.0"
 
 [features]
 default = []