Add cargo-outdated to devcontainer

.devcontainer/Dockerfile

@@ -3,11 +3,12 @@ FROM mcr.microsoft.com/devcontainers/base:ubuntu-22.04
 # Include lld linker to improve build times either by using environment variable
 # RUSTFLAGS="-C link-arg=-fuse-ld=lld" or with Cargo's configuration file (i.e see .cargo/config.toml).
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
-   && apt-get -y install clang lld libsqlite3-dev libmariadb-dev-compat libmariadb-dev libpq-dev \
+   && apt-get -y install clang lld libsqlite3-dev libmariadb-dev-compat libmariadb-dev libpq-dev pkg-config \
    && apt-get autoremove -y && apt-get clean -y
 
 USER vscode
 
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain 1.75 --no-modify-path -y
 
-RUN /home/vscode/.cargo/bin/cargo install cargo-release
+RUN /home/vscode/.cargo/bin/cargo install cargo-release
+RUN /home/vscode/.cargo/bin/cargo install --locked cargo-outdated