fix(postgres): use explicit schema in table identifier when altering comments

[B4nan]

Closes #4108

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (549beec) 99.68% compared to head (44aa537) 99.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4123      +/-   ##
==========================================
- Coverage   99.68%   99.66%   -0.02%     
==========================================
  Files         214      214              
  Lines       13799    13847      +48     
  Branches     3237     3258      +21     
==========================================
+ Hits        13755    13801      +46     
- Misses         41       43       +2     
  Partials        3        3              

Impacted Files	Coverage Δ
packages/mariadb/src/MariaDbSchemaHelper.ts	100.00% <ø> (ø)
packages/knex/src/schema/SchemaGenerator.ts	100.00% <100.00%> (ø)
packages/knex/src/schema/SchemaHelper.ts	100.00% <100.00%> (ø)
packages/mysql/src/MySqlSchemaHelper.ts	100.00% <100.00%> (ø)
packages/postgresql/src/PostgreSqlSchemaHelper.ts	100.00% <100.00%> (ø)

... and 9 files with indirect coverage changes

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