fix: ensure Twitter facade resolves as singleton (fixes #349)

[reliq]

This ensures that the same instance of accessor is resolved by the twitter facade/contract.

[codecov]

Codecov Report

Merging #352 (4c9dc65) into main (54a87de) will decrease coverage by 0.17%.
The diff coverage is 38.88%.

@@             Coverage Diff              @@
##               main     #352      +/-   ##
============================================
- Coverage     34.87%   34.70%   -0.18%     
- Complexity      358      359       +1     
============================================
  Files            31       31              
  Lines           800      804       +4     
============================================
  Hits            279      279              
- Misses          521      525       +4     

Impacted Files	Coverage Δ	Complexity Δ
src/ApiV1/Service/Twitter.php	8.33% <0.00%> (-1.67%)	9.00 <1.00> (+1.00)	⬇️
src/Concern/ApiV2Behavior.php	100.00% <ø> (ø)	2.00 <0.00> (ø)
src/Service/Accessor.php	100.00% <100.00%> (ø)	4.00 <1.00> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 54a87de...4c9dc65. Read the comment docs.