Timezone WET needs to be added to the ignore list

[olavloite]

Error:  Tests run: 10, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 119.6 s <<< FAILURE! -- in com.google.cloud.spanner.pgadapter.ITPsqlTest
Error:  com.google.cloud.spanner.pgadapter.ITPsqlTest.testTimestamptzParsing -- Time elapsed: 24.58 s <<< FAILURE!
org.junit.ComparisonFailure: 
Timestamp: 1974-08-20, Timezone: WET expected:<...974-08-20 00:00:00+0[0]
(1 row)

> but was:<...974-08-20 00:00:00+0[1]
(1 row)