Upgrade postgres to v1.3.4

[joejstuart]

The postgres driver was throwing error:
panic: runtime error: invalid memory address or nil pointer dereference
See: #184

[tekton-robot]

Hi @joejstuart. Thanks for your PR.

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[vinamra28]

/ok-to-test

[wlynch]

/lgtm

[tekton-robot]

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[enarha]

/kind bug