Update wasi-sdk to 27.0 in CI

This updates the wasi-sdk used in CI to build release binaries and run
CI with. No major motivation beyond keeping things up-to-date and
following the development of wasi-sdk.

Author: alexcrichton

src/ci/docker/host-x86_64/dist-various-2/Dockerfile

@@ -81,7 +81,7 @@ RUN /tmp/build-fuchsia-toolchain.sh
 COPY host-x86_64/dist-various-2/build-x86_64-fortanix-unknown-sgx-toolchain.sh /tmp/
 RUN /tmp/build-x86_64-fortanix-unknown-sgx-toolchain.sh
 
-RUN curl -L https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-25/wasi-sdk-25.0-x86_64-linux.tar.gz | \
+RUN curl -L https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-27/wasi-sdk-27.0-x86_64-linux.tar.gz | \
   tar -xz
 ENV WASI_SDK_PATH=/tmp/wasi-sdk-25.0-x86_64-linux
 

src/ci/docker/host-x86_64/test-various/Dockerfile

@@ -40,7 +40,7 @@ WORKDIR /
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
-RUN curl -L https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-25/wasi-sdk-25.0-x86_64-linux.tar.gz | \
+RUN curl -L https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-27/wasi-sdk-27.0-x86_64-linux.tar.gz | \
   tar -xz
 ENV WASI_SDK_PATH=/wasi-sdk-25.0-x86_64-linux