…to v3.0.3 (#627)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2020-11-16 22:53:18,494 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-spanner/./readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-16 22:53:19,534 synthtool [DEBUG] > Wrote metadata to ./readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/9da23d1e-5e7c-48ab-9f21-a6bac5e98730/targets

- [ ] To automatically regenerate this PR, check this box.

🤖 I have created a release \*beep\* \*boop\* 
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### Updating meta-information for bleeding-edge SNAPSHOT release.
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This PR was generated with [Release Please](https://.com/googleapis/release-please).

This reverts commit 990c612.

🤖 I have created a release \*beep\* \*boop\* 
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### [3.0.4](https://www..com/googleapis/java-spanner/compare/v3.0.3...v3.0.4) (2020-11-17)


### Reverts

* Revert "fix: skip failing backup tests for now" (#634) ([b22cd7d](https://www..com/googleapis/java-spanner/commit/b22cd7dfc377a0445534946af29500cee316e6b1)), closes [#634](https://www..com/googleapis/java-spanner/issues/634)
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This PR was generated with [Release Please](https://.com/googleapis/release-please).