Write "{}" for config (breaking change, 11482)

[StephenWeatherford]

Fixes #11482

This is a breaking change that keeps v0.20 or earlier from restoring modules published with versions with this change.

The original breaking change notification doesn't seem to have made it into the release notes, but we can put this into the new version:

This is a breaking change in how modules are published. This change will affect v0.20 and earlier, keeping them from being able to restore modules created in v0.23 or later.
v0.20 or earlier: Can read modules published with v0.22 or earlier. Will get an error trying to restore a module published with v0.23 or later.
v0.21, v0.22: Can read modules published earlier or later. Modules published with v0.21 can be read by earlier and later versions.
v0.23: Can read modules published earlier or later. Modules published with v0.23 can be read by v0.21 and later.

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 6423413006)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 6423413006

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 6423413006"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 6423413006

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 6423413006"

[github-actions]

Test Results

     132 files  ±0       132 suites  ±0   3h 57m 33s ⏱️ - 2m 10s
10 667 tests ±0  10 667 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
51 535 runs  ±0  51 535 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit f0e4d56. ± Comparison against base commit d7b6beb.

♻️ This comment has been updated with latest results.