Merge pull request #62 from kraken-build/nr/pin-cargo-0.73

Pin Rust toolchain to 1.73.0 giving us Cargo 1.73.0

Dockerfile

@@ -100,8 +100,8 @@ RUN : \
     && cargo install cargo-semver-checks \
     && cargo install sqlx-cli \
     && cargo install cargo-llvm-cov \
-    && rustup toolchain install nightly \
-    && rustup component add rustfmt --toolchain nightly
+    && rustup toolchain install 1.73.0 \
+    && rustup component add rustfmt --toolchain 1.73.0
 
 #
 # Protobuf tools

README.md

@@ -61,7 +61,7 @@ is built from various Ubuntu starting images.
 | proxy.py | Pipx (Python 3.10) | 2.4.3 |
 | pyenv | [pyenv-installer](https://github.com/pyenv/pyenv-installer) | latest |
 | Python | [ppa:deadsnakes/ppa](https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa) | 3.6 <sup>1)</sup>, 3.7, 3.8, 3.9, 3.10 <sup>default</sup>, 3.11 |
-| Rust | Rustup | latest |
+| Rust / Cargo | Rustup | 1.73.0 / 0.73.0 |
 | Rustup | rustup.rs | latest |
 | rustfmt | rustup | nightly (additionally) |
 | sccache | [GitHub releases](https://github.com/mozilla/sccache/releases) ([formula](formulae/sccache.py)) | 0.5.2 |