Merge branch 'fix-build'

Adresses 2 problems that got difficult to address independently:

- more dependencies continue to request rust 1.70
- the lack of a Cargo.lock caused reproducibility issues

* fix-build:
  Ship a Cargo.lock matching tested dependencies
  build: switch Rust requirement to 1.70

.github/workflows/rust.yml

@@ -17,7 +17,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: 1.66
+        toolchain: 1.70.0
         override: true
     - name: Installing dependency packages
       run: sudo apt update && sudo apt install -y libxen-dev protobuf-compiler
@@ -32,7 +32,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: 1.66
+        toolchain: 1.70.0
         override: true
     - name: Installing dependency packages
       run: sudo apt update && sudo apt install -y libxen-dev protobuf-compiler