Update transit_model to v0.55.0 (#22)

following hove-io/transit_model#888

Dockerfile

@@ -5,7 +5,7 @@ FROM rust:latest as builder
 WORKDIR /
 # this repo has no tagged releases ; we pin the version based on latest verified commit instead
 RUN git clone https://github.com/rust-transit/gtfs-to-geojson.git
-RUN git -C gtfs-to-geojson checkout 005a098062d7dc3b12704454e2c037fa0ee11172
+RUN git -C gtfs-to-geojson checkout 9ca9a25b895ba1b2fdf4d04e92895afec52d0608
 WORKDIR /gtfs-to-geojson
 RUN cargo build --release
 RUN strip ./target/release/gtfs-geojson
@@ -35,7 +35,7 @@ RUN strip ./target/release/main
 FROM kisiodigital/rust-ci:latest-proj8.1.0 as builder_proj
 WORKDIR /
 # we pin the version to avoid unexpected changes due to rebuild on our side
-RUN git clone --depth=1 --branch=v0.51.2 --single-branch https://github.com/CanalTP/transit_model
+RUN git clone --depth=1 --branch=v0.55.0 --single-branch https://github.com/CanalTP/transit_model
 WORKDIR /transit_model
 # NOTE: when using the kisio rust-ci as a base image, CARGO_TARGET_DIR is set to something like `/tmp/cargo-release`.
 # To avoid breaking the build in case of variable change upstream, we instead force the build to be local, which