Update Bazel dependencies to latest stable versions

[mmorel-35]

Description

Updated all Bazel dependencies to current stable releases from Bazel Central Registry:

• abseil-cpp: 20230125.1 → 20250814.1 (2+ years of updates)
• bazel_skylib: 1.2.1 → 1.8.2
• rules_cc: 0.0.9 → 0.2.14
• platforms: 0.0.11 → 1.0.0

Changes applied to both MODULE.bazel (bzlmod) and WORKSPACE to maintain compatibility across build modes. Added Bazel ecosystem support to Dependabot for automated monthly updates.

Bazel 9 Compatibility Fixes:

• Enabled bzlmod by default in .bazelrc (WORKSPACE is deprecated in Bazel 9)
• Added explicit load("@rules_cc//cc:defs.bzl", "cc_library") in BUILD.bazel (native C++ rules removed from built-ins in Bazel 9)
• Added rules_cc http_archive and compatibility_proxy_repo() to WORKSPACE for proper rules_cc setup
• Tested with Bazel 9.0.0rc3 and verified backward compatibility with Bazel 8.5.0

Code Quality Improvements:

• Sorted bazel_dep entries alphabetically in MODULE.bazel
• Sorted Dependabot ecosystems alphabetically
• Applied buildifier formatting to all Bazel files (BUILD.bazel, WORKSPACE, MODULE.bazel)

Motivation

Dependencies were significantly outdated. Abseil-cpp was 2+ years behind, missing critical bug fixes and API improvements. Modern Bazel tooling requires current dependency versions for optimal performance and security.

With Bazel 9 on the horizon, full compatibility is essential. In Bazel 9, native C++ rules (cc_library, cc_binary, etc.) have been removed from built-ins and must be explicitly loaded from @rules_cc. These changes ensure the codebase works with both current and future Bazel versions.

[dmehala]

LGTM. Thank you @mmorel-35