Updating RSC_VERSION fails on MacOS

[dbkegley]

During the latest release of Connect we found that our release automation break when run on MacOS due to this line:

rstudio-docker-products/Justfile

Line 277 in c635200

sed -i '/variable CONNECT_VERSION/!b;n;c\ \ \ \ default = "{{ RSC_VERSION }}"' docker-bake.hcl

just RSC_VERSION=2024.05.1 update-rsc-versions
+ sed -i '' 's/RSC_VERSION=.*/RSC_VERSION=2024.05.1/g' connect/.env connect/Dockerfile.ubuntu2204 connect-content-init/Dockerfile.ubuntu2204
+ sed -i '' 's/^RSC_VERSION := .*/RSC_VERSION := "2024.05.1"/g' Justfile
++ just _get-clean-version 2024.05.1
+ sed -i '' -E 's/[0-9]{4}\.[0-9]{1,2}\.[0-9]{1,2}/2024.05.1/g' connect/README.md connect-content-init/README.md
+ sed -i '/variable CONNECT_VERSION/!b;n;c\ \ \ \ default = "2024.05.1"' docker-bake.hcl
sed: 1: "docker-bake.hcl": extra characters at the end of d command
error: Recipe `update-rsc-versions` failed with exit code 1

We tried replacing the -i with {{ sed_vars }} but that doesn't seem to fix the issue either. Something to do with the new !b;n;c isn't playing nicely with BSD sed on mac. Right now we can only run this automation on Linux but most of our developers responsible for releases are on mac.