chore(all): auto-regenerate gapics (#5767)

* chore(all): auto-regenerate gapics

This is an auto-generated regeneration of the gapic clients by
cloud.google.com/go/internal/gapicgen. Once the corresponding genproto PR is
submitted, genbot will update this PR with a newer dependency to the newer
version of genproto and assign reviewers to this PR.

If you have been assigned to review this PR, please:

- Ensure that the version of genproto in go.mod has been updated.
- Ensure that CI is passing. If it's failing, it requires your manual attention.
- Approve and submit this PR if you believe it's ready to ship.

Corresponding genproto PR: googleapis/go-genproto#779

Changes:

chore(spanner/admin/database): remove unused imports from google/spanner/*
  PiperOrigin-RevId: 435163448
  Source-Link: googleapis/googleapis@db9d2a3

feat(aiplatform): add `service_account` to `BatchPredictionJob` in aiplatform `v1beta1` `batch_prediction_job.proto`
  PiperOrigin-RevId: 434935416
  Source-Link: googleapis/googleapis@dfdd5ee

feat(dataflow): Add the ability to plumb environment capabilities through v1beta3 protos.
  PiperOrigin-RevId: 434899727
  Source-Link: googleapis/googleapis@392ae91

go.mod

@@ -11,7 +11,7 @@ require (
 	go.opencensus.io v0.23.0
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
 	google.golang.org/api v0.73.0
-	google.golang.org/genproto v0.0.0-20220310185008-1973136f34c6
+	google.golang.org/genproto v0.0.0-20220322021311-435b647f9ef2
 	google.golang.org/grpc v1.45.0
 	google.golang.org/protobuf v1.28.0
 )

go.sum

@@ -549,8 +549,9 @@ google.golang.org/genproto v0.0.0-20220207164111-0872dc986b00/go.mod h1:5CzLGKJ6
 google.golang.org/genproto v0.0.0-20220218161850-94dd64e39d7c/go.mod h1:kGP+zUP2Ddo0ayMi4YuN7C3WZyJvGLZRh8Z5wnAqvEI=
 google.golang.org/genproto v0.0.0-20220222213610-43724f9ea8cf/go.mod h1:kGP+zUP2Ddo0ayMi4YuN7C3WZyJvGLZRh8Z5wnAqvEI=
 google.golang.org/genproto v0.0.0-20220304144024-325a89244dc8/go.mod h1:kGP+zUP2Ddo0ayMi4YuN7C3WZyJvGLZRh8Z5wnAqvEI=
-google.golang.org/genproto v0.0.0-20220310185008-1973136f34c6 h1:FglFEfyj61zP3c6LgjmVHxYxZWXYul9oiS1EZqD5gLc=
 google.golang.org/genproto v0.0.0-20220310185008-1973136f34c6/go.mod h1:kGP+zUP2Ddo0ayMi4YuN7C3WZyJvGLZRh8Z5wnAqvEI=
+google.golang.org/genproto v0.0.0-20220322021311-435b647f9ef2 h1:3n0D2NdPGm0g0wrVJzXJWW5CBOoqgGBkDX9cRMJHZAY=
+google.golang.org/genproto v0.0.0-20220322021311-435b647f9ef2/go.mod h1:hAL49I2IFola2sVEjAn7MEwsja0xp51I0tlGAf9hz4E=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=