deps: update dependency com.google.cloud:google-cloud-spanner-bom to v1.61.0 (#872)
deps: update dependency com.google.cloud:google-cloud-spanner-bom to v1.61.0 (#872)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-spanner-bom](https://togithub.com/googleapis/java-spanner) | minor | `1.60.0` -> `1.61.0` |

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### Release Notes

<details>
<summary>googleapis/java-spanner</summary>

### [`v1.61.0`](https://togithub.com/googleapis/java-spanner/blob/master/CHANGELOG.md#&#8203;1610-httpswwwgithubcomgoogleapisjava-spannercomparev1600v1610-2020-09-09)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v1.60.0...v1.61.0)

##### Features

-   Add experimental DirectPath support ([#&#8203;396](https://www.github.com/googleapis/java-spanner/issues/396)) ([46264d1](https://www.github.com/googleapis/java-spanner/commit/46264d11529accde7b520638264732937b2feb03))
-   support setting timeout per RPC ([#&#8203;379](https://www.github.com/googleapis/java-spanner/issues/379)) ([5d115d4](https://www.github.com/googleapis/java-spanner/commit/5d115d49b988b3fc1c59ae41ee53d7c5a83b4d11)), closes [#&#8203;378](https://www.github.com/googleapis/java-spanner/issues/378)

##### Bug Fixes

-   iterate over async result set in sync ([#&#8203;416](https://www.github.com/googleapis/java-spanner/issues/416)) ([45d8419](https://www.github.com/googleapis/java-spanner/commit/45d8419250c904b2f785d6cc5abacf098e5781de))
-   remove potential infinite loop in administrative requests ([#&#8203;398](https://www.github.com/googleapis/java-spanner/issues/398)) ([81d2c76](https://www.github.com/googleapis/java-spanner/commit/81d2c7634edd30efd428846fdbc468aee5406ed5))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.9.0 ([#&#8203;409](https://www.github.com/googleapis/java-spanner/issues/409)) ([ae43165](https://www.github.com/googleapis/java-spanner/commit/ae43165ba736e17b780ce128d97b9757039275c2))
-   update dependency org.openjdk.jmh:jmh-core to v1.25.1 ([#&#8203;399](https://www.github.com/googleapis/java-spanner/issues/399)) ([52fc363](https://www.github.com/googleapis/java-spanner/commit/52fc3638854116ab87b7e6bdd719134d3108229d))
-   update dependency org.openjdk.jmh:jmh-core to v1.25.2 ([#&#8203;412](https://www.github.com/googleapis/java-spanner/issues/412)) ([86d18cd](https://www.github.com/googleapis/java-spanner/commit/86d18cdcc2d3aa0771e3f331ebb50591ce811113))
-   update dependency org.openjdk.jmh:jmh-generator-annprocess to v1.25.2 ([#&#8203;400](https://www.github.com/googleapis/java-spanner/issues/400)) ([8a40a96](https://www.github.com/googleapis/java-spanner/commit/8a40a96123831ce992d18ecff6e699dbb7ffc82c))

##### Documentation

-   updates bom and spanner version in readme ([#&#8203;415](https://www.github.com/googleapis/java-spanner/issues/415)) ([def7fdf](https://www.github.com/googleapis/java-spanner/commit/def7fdf9b11fc0f8e7bacd6be41875b6542f64d5))

</details>

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