[backend] Update dependency org.postgresql:postgresql to v42.7.8 (release/current)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.postgresql:postgresql (source)	42.7.7 -> 42.7.8

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Warning

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Release Notes

pgjdbc/pgjdbc (org.postgresql:postgresql)

v42.7.8

Added

• feat: Add configurable boolean-to-numeric conversion for ResultSet getters PR #​3796

Changed

• perf: remove QUERY_ONESHOT flag when calling getMetaData PR #​3783
• perf: use BufferedInputStream with FileInputStream PR #​3750
• perf: enable server-prepared statements for DatabaseMetaData

Fixed

• fix: avoid NullPointerException when cancelling a query if cancel key is not known yet
• fix: Change "PST" timezone in TimestampTest to "Pacific Standard Time" PR #​3774
• fix: traverse the current dimension to get the correct pos in PgArray#calcRemainingDataLength PR #​3746
• fix: make sure getImportedExportedKeys returns columns in consistent order
• fix: Add "SELF_REFERENCING_COL_NAME" field to getTables' ResultSetMetaData to fix NullPointerException PR #​3660
• fix: unable to open replication connection to servers < 12
• fix: avoid closing statement caused by driver's internal ResultSet#close()
• fix: return empty metadata for empty catalog names as it was before
• fix: Incorrect class comparison in PGXmlFactoryFactory validation

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.03%. Comparing base (f292947) to head (5572368).
⚠️ Report is 31 commits behind head on release/current.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/current    #4218      +/-   ##
=====================================================
+ Coverage              49.01%   49.03%   +0.01%     
- Complexity              3502     3506       +4     
=====================================================
  Files                    875      875              
  Lines                  26097    26097              
  Branches                1947     1947              
=====================================================
+ Hits                   12791    12796       +5     
+ Misses                 12539    12534       -5     
  Partials                 767      767              

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