fix(ci) lock rust toolchain at 1.93.0 to unblock (#11703)

## Summary
CI is broken on main because our CI toolchain is trying to run 1.93.1
while our rust toolchain is locked at 1.93.0. I'm sure it's likely safe
to upgrade, but let's keep things stable for now.

## Testing
- [x] CI should hopefully pass

.github/workflows/rust-ci.yml

@@ -59,7 +59,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.93
+      - uses: dtolnay/rust-toolchain@1.93.0
         with:
           components: rustfmt
       - name: cargo fmt
@@ -75,7 +75,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.93
+      - uses: dtolnay/rust-toolchain@1.93.0
       - uses: taiki-e/install-action@44c6d64aa62cd779e873306675c7a58e86d6d532 # v2
         with:
           tool: cargo-shear
@@ -196,7 +196,7 @@ jobs:
             fi
             sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends "${packages[@]}"
           fi
-      - uses: dtolnay/rust-toolchain@1.93
+      - uses: dtolnay/rust-toolchain@1.93.0
         with:
           targets: ${{ matrix.target }}
           components: clippy
@@ -513,7 +513,7 @@ jobs:
       - name: Install DotSlash
         uses: facebook/install-dotslash@v2
 
-      - uses: dtolnay/rust-toolchain@1.93
+      - uses: dtolnay/rust-toolchain@1.93.0
         with:
           targets: ${{ matrix.target }}
 

.github/workflows/rust-release-windows.yml

@@ -82,7 +82,7 @@ jobs:
           Write-Host "Total RAM: $ramGiB GiB"
           Write-Host "Disk usage:"
           Get-PSDrive -PSProvider FileSystem | Format-Table -AutoSize Name, @{Name='Size(GB)';Expression={[math]::Round(($_.Used + $_.Free) / 1GB, 1)}}, @{Name='Free(GB)';Expression={[math]::Round($_.Free / 1GB, 1)}}
-      - uses: dtolnay/rust-toolchain@1.93
+      - uses: dtolnay/rust-toolchain@1.93.0
         with:
           targets: ${{ matrix.target }}
 

.github/workflows/rust-release.yml

@@ -123,7 +123,7 @@ jobs:
             sudo apt-get update -y
             sudo DEBIAN_FRONTEND=noninteractive apt-get install -y libubsan1
           fi
-      - uses: dtolnay/rust-toolchain@1.93
+      - uses: dtolnay/rust-toolchain@1.93.0
         with:
           targets: ${{ matrix.target }}
 

.github/workflows/sdk.yml

@@ -31,7 +31,7 @@ jobs:
           node-version: 22
           cache: pnpm
 
-      - uses: dtolnay/rust-toolchain@1.93
+      - uses: dtolnay/rust-toolchain@1.93.0
 
       - name: build codex
         run: cargo build --bin codex

.github/workflows/shell-tool-mcp.yml

@@ -105,7 +105,7 @@ jobs:
             sudo DEBIAN_FRONTEND=noninteractive apt-get install -y libubsan1
           fi
 
-      - uses: dtolnay/rust-toolchain@1.93
+      - uses: dtolnay/rust-toolchain@1.93.0
         with:
           targets: ${{ matrix.target }}