update toolchain also for the CI

.github/workflows/ci.yml

@@ -227,9 +227,9 @@ jobs:
       - uses: Swatinem/rust-cache@v2
       - name: Build dev profile
         run: cargo build -Zbuild-std=std,panic_abort --target aarch64-unknown-hermit --package hello_world
-      - run: rustup toolchain install nightly-2022-08-01 --target aarch64-unknown-none-softfloat --component llvm-tools-preview
+      - run: rustup toolchain install nightly-2023-04-05 --target aarch64-unknown-none-softfloat --component llvm-tools-preview
       - name: Build loader
-        run: cargo +nightly-2022-08-01 xtask build --target aarch64
+        run: cargo +nightly-2023-04-05 xtask build --target aarch64
         working-directory: loader
         env:
           HERMIT_APP: ../../../../target/aarch64-unknown-hermit/debug/hello_world

Dockerfile

@@ -5,7 +5,7 @@ ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH \
     # Manually sync this with rust-toolchain.toml!
-    RUST_VERSION=nightly-2023-02-07 \
+    RUST_VERSION=nightly-2023-04-05 \
     RUST_COMPONENTS="llvm-tools-preview rust-src" \
     RUST_TARGETS="x86_64-unknown-none"