build: Bump MSRV to 1.70 for clap crate

See: #5925

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>

.github/workflows/build.yaml

@@ -13,7 +13,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - "1.66"
+          - "1.70"
         target:
           - x86_64-unknown-linux-gnu
           - x86_64-unknown-linux-musl

.github/workflows/release.yaml

@@ -16,29 +16,29 @@ jobs:
       - name: Install Rust toolchain (x86_64-unknown-linux-gnu)
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: "1.67.1"
+          toolchain: "1.70"
           target: x86_64-unknown-linux-gnu
       - name: Install Rust toolchain (x86_64-unknown-linux-musl)
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: "1.67.1"
+          toolchain: "1.70"
           target: x86_64-unknown-linux-musl
       - name: Build
         uses: actions-rs/cargo@v1
         with:
-          toolchain: "1.67.1"
+          toolchain: "1.70"
           command: build
           args: --all --release --features mshv --target=x86_64-unknown-linux-gnu
       - name: Static Build
         uses: actions-rs/cargo@v1
         with:
-          toolchain: "1.67.1"
+          toolchain: "1.70"
           command: build
           args: --all --release --features mshv --target=x86_64-unknown-linux-musl
       - name: Install Rust toolchain (aarch64-unknown-linux-musl)
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: "1.67.1"
+          toolchain: "1.70"
           target: aarch64-unknown-linux-musl
           override: true
       - name: Create Release