[tiny] Fix HEC error when using conf example

[pjanotti]

Avoid the following error when just copying the .conf example for quick tests (not worried about the data failing to be ingested)

error decoding 'exporters': error reading configuration for "splunk_hec": decoding failed due to the following error
'token' expected type 'configopaque.String', got unconvertible type 'int', value: '12345'

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.90%. Comparing base (787a646) to head (4fcf26d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6266      +/-   ##
==========================================
+ Coverage   44.89%   44.90%   +0.01%     
==========================================
  Files         390      390              
  Lines       26994    26994              
==========================================
+ Hits        12119    12123       +4     
+ Misses      14008    14003       -5     
- Partials      867      868       +1     

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