Update dependency org.postgresql:postgresql to v42.7.8

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This PR contains the following updates:

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

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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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