Bump version to 0.27

[shenglol]

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 8976952055)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 8976952055

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 8976952055"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 8976952055

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 8976952055"

[github-actions]

Test Results

    66 files   -     33      66 suites   - 33   23m 10s ⏱️ - 8m 22s
10 877 tests  -     20  10 876 ✅  -     20  1 💤 ±0  0 ❌ ±0 
25 650 runs   - 12 821  25 648 ✅  - 12 820  2 💤  - 1  0 ❌ ±0 

Results for commit df347ed. ± Comparison against base commit 1c6b9b5.