Psalm fixes

[darkdef]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

Merging #92 (e21f49b) into dev (c872e69) will decrease coverage by 0.07%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##                dev      #92      +/-   ##
============================================
- Coverage     88.80%   88.73%   -0.08%     
- Complexity      373      374       +1     
============================================
  Files            14       14              
  Lines           929      932       +3     
============================================
+ Hits            825      827       +2     
- Misses          104      105       +1     

Impacted Files	Coverage Δ
src/PDO/SchemaPDOSqlite.php	94.29% <75.00%> (-0.37%)	⬇️

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