chore: use pprof only if target_os is not windows

[lzchen]

Following this pr introduced a breaking change for running cargo bench in Windows due to pprof not being able to compile in Windows. Similar to this, only use pprof if not on a Windows machine.

[codecov]

Codecov Report

Patch coverage: 23.4% and no project coverage change.

Comparison is base (7607ad3) 49.6% compared to head (cc47093) 49.7%.
Report is 8 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1205   +/-   ##
=====================================
  Coverage   49.6%   49.7%           
=====================================
  Files        164     172    +8     
  Lines      20653   20710   +57     
=====================================
+ Hits       10258   10301   +43     
- Misses     10395   10409   +14     

Files Changed	Coverage Δ
opentelemetry-otlp/src/exporter/grpcio/logs.rs	0.0% <0.0%> (ø)
opentelemetry-otlp/src/exporter/grpcio/mod.rs	35.4% <0.0%> (ø)
opentelemetry-otlp/src/exporter/grpcio/trace.rs	0.0% <0.0%> (ø)
opentelemetry-otlp/src/exporter/http/logs.rs	0.0% <0.0%> (ø)
opentelemetry-otlp/src/exporter/http/metrics.rs	0.0% <0.0%> (ø)
opentelemetry-otlp/src/exporter/http/mod.rs	0.0% <0.0%> (ø)
opentelemetry-otlp/src/exporter/http/trace.rs	0.0% <0.0%> (ø)
opentelemetry-otlp/src/exporter/tonic/logs.rs	0.0% <0.0%> (ø)
opentelemetry-otlp/src/exporter/tonic/metrics.rs	0.0% <0.0%> (ø)
opentelemetry-otlp/src/lib.rs	32.2% <ø> (ø)
... and 12 more

... and 2 files with indirect coverage changes

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