Release Datastore v1.2.0 (googleapis#2447)

* Release Datastore v1.2.0

all: release v0.58.0

This change will be tagged v0.58.0.

Change-Id: I5a8616646142c5d1e6ed6b515ea53cd5bf9d8a1a
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/57270
Reviewed-by: Tyler Bui-Palsulich <[email protected]>

storage: release storage/v1.9.0

Change-Id: I03703dbcba9c4f35f347405d2c3d07be54951a62
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/57110
Reviewed-by: Frank Natividad <[email protected]>
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Cody Oss <[email protected]>

pubsub: release pubsub/v1.4.0

This PR will be tagged pubsub/v1.4.0

Change-Id: Ie5cbef9818b1d409bcb144dd5d706b5c89396c51
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/56970
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Cody Oss <[email protected]>

spanner: release v1.6.0

Change-Id: I922149fc04edd5e761da705a1ad788d6f54d3832
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/56777
Reviewed-by: kokoro <[email protected]>
Reviewed-by: David Symonds <[email protected]>

bigquery: release bigquery/v1.8.0

This PR will be tagged bigquery/v1.8.0

Change-Id: I3ff32202395a9cad099f4acfd272f7abd39d937a
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/56612
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Cody Oss <[email protected]>

storage: release storage/v1.8.0

Change-Id: I8ec5b8ab1f18b2df5a61df77e8b9b60305d0af03
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/56310
Reviewed-by: Emmanuel Odeke <[email protected]>
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Cody Oss <[email protected]>
Reviewed-by: Frank Natividad <[email protected]>

all: release v0.57.0

This commit will be tagged v0.57.0.

Change-Id: Ie8cd607757d2ddfc84f2ef7e8f48a527a2dfa868
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/55810
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Tyler Bui-Palsulich <[email protected]>

bigquery: release bigquery/v1.7.0

This PR will be tagged as bigquery/v1.7.0

Change-Id: If5fdab18a1a24d3c00683d3ee0b1f22a75127738
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/56030
Reviewed-by: Alex Hong <[email protected]>

storage: release storage/v1.7.0

Change-Id: I598b145158b3c51c4805f0f680e7a2a712eef117
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/55850
Reviewed-by: kokoro <[email protected]>
Reviewed-by: Frank Natividad <[email protected]>