Fix ProcessResource directory separator

[jack-berg]

Synching fix in opentelemetry-java-instrumentation PR #6716.

[codecov]

Codecov Report

Base: 90.78% // Head: 90.78% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (ce50ad0) compared to base (a1cf20d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4782      +/-   ##
============================================
- Coverage     90.78%   90.78%   -0.01%     
- Complexity     4822     4823       +1     
============================================
  Files           554      554              
  Lines         14383    14383              
  Branches       1397     1397              
============================================
- Hits          13058    13057       -1     
- Misses          909      910       +1     
  Partials        416      416              

Impacted Files	Coverage Δ
...metry/sdk/extension/resources/ProcessResource.java	81.25% <100.00%> (ø)
...metry/sdk/metrics/export/PeriodicMetricReader.java	87.14% <0.00%> (-2.86%)	⬇️
...ava/io/opentelemetry/sdk/internal/RateLimiter.java	100.00% <0.00%> (+5.88%)	⬆️

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