update benchmarks/tracking.py for SingleAxisTracker deprecation

[wholmgren]

Describe the bug
SingleAxisTracker is deprecated, but the tracking.py benchmark still uses it:

pvlib-python/benchmarks/benchmarks/tracking.py

Line 20 in 3f397ed

self.tracker = tracking.SingleAxisTracker()

To Reproduce
run asv tests. or look at the asv quick CI output

Expected behavior
no deprecation warnings in the benchmark test suite

Screenshots
If applicable, add screenshots to help explain your problem.

Versions:

• pvlib.__version__: 0.9. Drop py3.6, add 3.10; switch CI from macos-10.15 to macos-latest #1507

[Naman-Priyadarshi]

I wanted to work on the issue! Should i just remove the time_tracker_singleaxis function from the benchmark file?

Also when running asv dev I noticed that some of the benchmarking functions were failing, should i open a new issue regarding the same?

[wholmgren]

Thanks @Naman-Priyadarshi, that would be great. Yes to both of your questions.