Added ThreadLocal to StaticResources

[RezviyBelorus]

No description provided.

[codecov]

Codecov Report

Merging #342 into integration will decrease coverage by 0.03%.
The diff coverage is 17.5%.

@@                Coverage Diff                @@
##             integration     #342      +/-   ##
=================================================
- Coverage          25.11%   25.08%   -0.04%     
  Complexity           857      857              
=================================================
  Files                233      233              
  Lines              12739    12757      +18     
  Branches            1800     1802       +2     
=================================================
  Hits                3200     3200              
- Misses              9173     9191      +18     
  Partials             366      366

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/org/verapdf/tools/StaticResources.java	17.5% <17.5%> (-14.32%)	2 <2> (ø)

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