bind: Upgrade from 9.18 to 9.20 series

[xnox]

Bind uses even/odd series for stable/devel releases, with 9.20.x being
the latest stable and 9.21.x being the latest devel. Ideally we would
have "no-odd" semver flag in our update monitors; or jut a regexp
support for tag filtering.

Noticed via OSS Security post about 9.20.4 critical issue.

With this update, a new PR should be opened by the bot to upgrade to v9.20.x series:

$ GITHUB_TOKEN=$(gh auth token) ~/chainguard-dev/mono/cg/cg check update bind.yaml 
2024/12/21 11:06:32 WARN using GITHUB_TOKEN for token exchange
2024/12/21 11:06:32 INFO found 1 packages

2024/12/21 11:06:32 INFO checking package bind: bind
2024/12/21 11:06:32 INFO [1/1] bind: checking release monitor using id 374094

2024/12/21 11:06:33 INFO found dereferenced tag v9.20.4 for package with commit 283ac230b9277cad7ea509cafcd404573a7270ab
2024/12/21 11:06:33 INFO commit SHA for package bind: 283ac230b9277cad7ea509cafcd404573a7270ab
2024/12/21 11:06:33 INFO attempting to bump version to 9.20.4
2024/12/21 11:06:33 INFO processing git-checkout node
2024/12/21 11:06:33 INFO   expected-commit: 283ac230b9277cad7ea509cafcd404573a7270ab
2024/12/21 11:06:34 INFO git-checkout was successful package=bind
2024/12/21 11:06:34 INFO update config passed validation for packages bind.yaml

[octo-sts]

Gen AI suggestions to solve the build error:

Based on the build error, I'll analyze and provide a solution:

• Detected Error:

Package requirements (liburcu >= 0.10.0 liburcu-cds >= 0.10.0) were not met:
Package 'liburcu' not found
Package 'liburcu-cds' not found

• Error Category: Dependency

• Failure Point: autoconf/configure step

• Root Cause Analysis: The build is failing because it requires the userspace RCU (liburcu) library and its CDS component, which are missing from the build environment.

• Suggested Fix:
Add the following dependencies to the environment.packages section:

environment:
  contents:
    packages:
      - liburcu
      - liburcu-dev
      # ... existing packages ...

• Explanation: BIND uses the userspace RCU (Read-Copy-Update) library for concurrent programming optimization. Adding these packages will provide the required libraries and development files needed for compilation.

• Additional Notes:

• liburcu is a userspace implementation of the RCU (Read-Copy-Update) synchronization mechanism
• The error indicates BIND requires version 0.10.0 or higher
• Both the runtime library and development files are needed for compilation

• References:

• BIND9 Build Dependencies: https://gitlab.isc.org/isc-projects/bind9/-/blob/main/DEPENDENCIES.md
• liburcu Documentation: https://liburcu.org/
• Original BIND Issue: https://gitlab.isc.org/isc-projects/bind9/-/issues/3095