ci(): remove bitnami postgres image

[Malaydewangan09]

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[github-actions]

🧪 Java Unit Tests

	Tests	Passed ☑️	Skipped ⚠️	Failed ❌️	Time ⏱
Java Tests Report	155 ran	123 ✅	16 ⚠️	16 ❌	3m 27s 351ms

Test	Result	Time ⏱
Java Tests Report
BatchTest.insert()	❌ failure	8s 307ms
BatchTest.namedInsert()	❌ failure	376ms
BatchTest.namedColumnsInsert()	❌ failure	149ms
BatchTest.noSqlWithNamedColumnsForInsert()	❌ failure	195ms
BatchTest.noSqlForInsert()	❌ failure	156ms
CopyTest.copy()	❌ failure	198ms
PgsqlTest.selectWithCompositeType()	❌ failure	876ms
PgsqlTest.selectWithVoidObject()	❌ failure	211ms
PgsqlTest.selectAndFetchOne()	❌ failure	100ms
PgsqlTest.updateFromFlow()	❌ failure	57ms
PgsqlTest.[1] null	❌ failure	150ms
PgsqlTest.[2]	❌ failure	127ms
PgsqlTest.[3] jdbc:mysql://127.0.0.1:64790/kestra	❌ failure	172ms
PgsqlTest.selectAndFetch()	❌ failure	154ms
PgsqlTest.selectAndFetchOne_EmptyResult()	❌ failure	145ms
PgsqlTest.selectAndFetchToFile()	❌ failure	36ms