fix(deps): address missing and outdated dependencies

[nicolethoen]

This PR addresses the missing Rspack dependencies in the @patternfly/documentation-framework
package and consolidates multiple Snyk security updates.

Primary Fix

• Added @rspack/core: ^1.5.6 to @patternfly/documentation-framework dependencies (fixes
  missing dependency issue)
• Added @rspack/dev-server: ^1.1.4 to @patternfly/documentation-framework dependencies
• Removed @rspack/cli, @rspack/core, and @rspack/dev-server from root devDependencies
  (moved to where they're actually used)
• Fixed yaml.safeLoad() → yaml.load() in parseMD.js (required for js-yaml v4
  compatibility)

Security Updates Included

This PR consolidates the following Snyk security PRs:

✅ Fully Resolved PRs

• #4912 - Security upgrade astro from
  5.16.0 to 5.16.10
• #4911 - Security upgrade
  webpack-bundle-analyzer from 4.10.2 to 5.2.0
• #4899 - Security upgrade express
  from 4.21.2 to 4.22.0
• #4889 - Security upgrade express
  from 4.21.2 to 4.22.0 (duplicate)
• #4873 - Security upgrade glob from
  11.0.3 to 11.1.0
• #4863 - Security upgrade js-yaml
  from 3.14.0 to 4.1.1
• #4845 - Security upgrade astro from
  5.7.13 to 5.13.10 (superseded by [Snyk] Security upgrade astro from 5.16.0 to 5.16.10 #4912)
• #4822 - Security upgrade astro from
  5.7.13 to 5.14.3 (superseded by [Snyk] Security upgrade astro from 5.16.0 to 5.16.10 #4912)

✅ Partially Resolved PRs

• #4894 - Fix for 1 vulnerability
  • @patternfly/patternfly-doc-core: 1.15.3 → 1.15.5 (already merged)
  • astro: 5.16.0 → 5.16.3 (superseded by update to 5.16.10)

Changes by Package

Root package.json:

• Removed @rspack/cli, @rspack/core, @rspack/dev-server from devDependencies

packages/documentation-framework/package.json:

• Added @rspack/core: ^1.5.6
• Added @rspack/dev-server: ^1.1.4
• Updated express: 4.21.2 → 4.22.0
• Updated glob: 11.0.3 → 11.1.0
• Updated js-yaml: 3.14.0 → 4.1.1
• Updated webpack-bundle-analyzer: 4.10.2 → 5.2.0

packages/documentation-framework/scripts/md/parseMD.js:

• Fixed breaking change: yaml.safeLoad() → yaml.load()

packages/site/package.json:

• Updated astro: 5.15.9 → 5.16.10

[patternfly-build]

Preview: https://pf-org--pr-4921-site.surge.sh

[patternfly-build]

Your changes have been released in:

• @patternfly/ast-helpers@1.4.0-alpha.335
• @patternfly/documentation-framework@6.33.9

Thanks for your contribution! 🎉