Fix linter rule: Max variables limit increased from 256 -> 512

[StephenWeatherford]

Fixes #15457

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 11674138878)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 11674138878

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 11674138878"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 11674138878

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 11674138878"

[github-actions]

Dotnet Test Results

    72 files   -     35      72 suites   - 35   29m 0s ⏱️ - 14m 49s
11 394 tests  -     22  11 394 ✅  -     22  0 💤 ±0  0 ❌ ±0 
26 519 runs   - 13 246  26 519 ✅  - 13 246  0 💤 ±0  0 ❌ ±0 

Results for commit 07f1958. ± Comparison against base commit c5f8633.

♻️ This comment has been updated with latest results.