[Synthetics] Update PL version to 1.45.0

[jakepruitt]

What this PR does / why we need it:

Upgrade the private location to version 1.45.0.

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [ ] Chart Version bumped
• [ ] Documentation has been updated with helm-docs (run: .github/helm-docs.sh)
• [ ] CHANGELOG.md has been updated
• [ ] Variables are documented in the README.md
• [ ] For Datadog Operator chart or value changes update the test baselines (run: make update-test-baselines)

[jakepruitt]

/merge

[dd-devflow[bot]]

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