go.mod: go-libddwaf: 2.2.0 -> 2.2.2

[eliottness]

What does this PR do?

Upgrade https://github.com/DataDog/go-libddwaf to latest

Motivation

Hot fixes for API Security and Data races

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.

For Datadog employees:

• If this PR touches code that handles credentials of any kind, such as Datadog API keys, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.

Unsure? Have a question? Request a review!

[pr-commenter]

Benchmarks

Benchmark execution time: 2023-12-07 10:51:22

Comparing candidate commit c2a64e5 in PR branch eliott.bouhana/upgrade-go-libddwaf with baseline commit 3dc6559 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 40 metrics, 1 unstable metrics.