Undo most of the nightly update

Author: alexcrichton

.github/actions/install-rust/action.yml

@@ -28,7 +28,7 @@ runs:
         elif [ "${{ inputs.toolchain }}" = "msrv" ]; then
           echo "version=1.$msrv.0" >> "$GITHUB_OUTPUT"
         elif [ "${{ inputs.toolchain }}" = "wasmtime-ci-pinned-nightly" ]; then
-          echo "version=nightly-2024-10-22" >> "$GITHUB_OUTPUT"
+          echo "version=nightly-2024-10-02" >> "$GITHUB_OUTPUT"
         else
           echo "version=${{ inputs.toolchain }}" >> "$GITHUB_OUTPUT"
         fi