go.mod: update github.com/DataDog/sketches-go to v1.4.5

[darccio]

What does this PR do?

Upgrades sketches-go to v1.4.5, reducing the dependency area with github.com/golang/protobuf.

Motivation

Removing github.com/golang/protobuf from our go.mod, as third party vulnerability scanners tend to warn about it, even if it's not compiled into the final binary.

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.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

Unsure? Have a question? Request a review!

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-05-21 11:28:49

Comparing candidate commit dc7b892 in PR branch dario.castane/upgrade-sketches-go-v1.4.5 with baseline commit 5c8a345 in branch main.

Found 3 performance improvements and 0 performance regressions! Performance is the same for 40 metrics, 1 unstable metrics.

scenario:BenchmarkPartialFlushing/Disabled-24

• 🟩 execution_time [-8.308ms; -5.833ms] or [-2.894%; -2.032%]

scenario:BenchmarkPartialFlushing/Enabled-24

• 🟩 execution_time [-9.102ms; -5.908ms] or [-3.192%; -2.072%]

scenario:BenchmarkSingleSpanRetention/no-rules-24

• 🟩 execution_time [-6.262µs; -5.321µs] or [-2.552%; -2.168%]