Enable unstable feature reqwest/http3 in CI (#1261)

For dev and release build, so that pre-built binaries of
`cargo-binstall` can utilize http3 protocol.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

.github/workflows/ci.yml

@@ -23,6 +23,7 @@ concurrency:
 env:
   CARGO_TERM_COLOR: always
   CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
+  JUST_ENABLE_H3: true
 
 jobs:
   test:

.github/workflows/release-build.yml

@@ -48,6 +48,7 @@ jobs:
       JUST_USE_CARGO_ZIGBUILD: ${{ matrix.c }}
       JUST_FOR_RELEASE: true
       JUST_USE_AUDITABLE: true
+      JUST_ENABLE_H3: true
 
     steps:
     - uses: actions/checkout@v3