Need to update bigtable-version properties in POM file

[sahijsran]

Need to update bigtable-version properties in POM file, as it is still using the old version of Bigtable

https://github.com/GoogleCloudPlatform/cloud-bigtable-examples/blob/main/quickstart/pom.xml

---

1.4.0 1.4.3

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>