[tune](deps): Bump sigopt in /python/requirements/tune (ray-project#16004)

Bumps [sigopt](https://sigopt.com/) from 5.7.0 to 7.4.0.

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

python/requirements/tune/requirements_tune.txt

@@ -27,7 +27,7 @@ pytorch-lightning-bolts==0.2.5
 pytorch-lightning==1.0.3
 scikit-learn==0.24.2
 scikit-optimize==0.8.1
-sigopt==5.7.0
+sigopt==7.4.0
 smart_open==5.0.0
 tensorflow-probability==0.11.1
 timm==0.4.5