ci: bump actions/checkout from 5 to 6 for bash-prg-hash (#858)

Author: dependabot[bot]

.github/workflows/bash-prg-hash.yml

@@ -40,7 +40,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: RustCrypto/actions/cargo-cache@master
       - uses: dtolnay/rust-toolchain@master
         with:
@@ -58,7 +58,7 @@ jobs:
           - ${{needs.set-msrv.outputs.msrv}}
           - stable
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: RustCrypto/actions/cargo-cache@master
       - uses: dtolnay/rust-toolchain@master
         with: