chore: use gapic-generator-python 1.3.1 (#24)
chore: use gapic-generator-python 1.3.1 (#24)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 472772457

Source-Link: https://github.com/googleapis/googleapis/commit/855b74d203deeb0f7a0215f9454cdde62a1f9b86

Source-Link: https://github.com/googleapis/googleapis-gen/commit/b64b1e7da3e138f15ca361552ef0545e54891b4f
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiYjY0YjFlN2RhM2UxMzhmMTVjYTM2MTU1MmVmMDU0NWU1NDg5MWI0ZiJ9
googleapis/python-dataform,googleapis/python-dataform