Bump google.golang.org/grpc in /learning/tour-of-beam/backend

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.49.0 to 1.82.1.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.49.0...v1.82.1)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-version: 1.82.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

learning/tour-of-beam/backend/go.mod

@@ -15,18 +15,82 @@
 
 module beam.apache.org/learning/tour-of-beam/backend
 
-go 1.16
+go 1.25.0
 
 require (
 	github.com/GoogleCloudPlatform/functions-framework-go v1.5.3
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
-	cloud.google.com/go/datastore v1.8.0
-	cloud.google.com/go/firestore v1.7.0 // indirect
+	cel.dev/expr v0.25.1 // indirect
+	cloud.google.com/go v0.120.0 // indirect
+	cloud.google.com/go/auth v0.15.0 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
+	cloud.google.com/go/compute/metadata v0.9.0 // indirect
+	cloud.google.com/go/functions v1.19.3 // indirect
+	cloud.google.com/go/iam v1.4.0 // indirect
+	cloud.google.com/go/longrunning v0.6.6 // indirect
+	cloud.google.com/go/monitoring v1.24.1 // indirect
+	cloud.google.com/go/storage v1.50.0 // indirect
+	cloud.google.com/go/trace v1.11.5 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.32.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.50.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.50.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cloudevents/sdk-go/v2 v2.6.1 // indirect
+	github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/envoyproxy/go-control-plane/envoy v1.37.0 // indirect
+	github.com/envoyproxy/protoc-gen-validate v1.3.3 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-jose/go-jose/v4 v4.1.4 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/s2a-go v0.1.9 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.6 // indirect
+	github.com/googleapis/gax-go/v2 v2.14.1 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/spiffe/go-spiffe/v2 v2.6.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/detectors/gcp v1.43.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.60.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.60.0 // indirect
+	go.opentelemetry.io/otel v1.43.0 // indirect
+	go.opentelemetry.io/otel/metric v1.43.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.43.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.43.0 // indirect
+	go.opentelemetry.io/otel/trace v1.43.0 // indirect
+	go.uber.org/atomic v1.7.0 // indirect
+	go.uber.org/multierr v1.6.0 // indirect
+	go.uber.org/zap v1.16.0 // indirect
+	golang.org/x/crypto v0.50.0 // indirect
+	golang.org/x/net v0.53.0 // indirect
+	golang.org/x/oauth2 v0.36.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.43.0 // indirect
+	golang.org/x/text v0.36.0 // indirect
+	golang.org/x/time v0.11.0 // indirect
+	google.golang.org/api v0.228.0 // indirect
+	google.golang.org/appengine/v2 v2.0.2 // indirect
+	google.golang.org/genproto v0.0.0-20250324211829-b45e905df463 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260414002931-afd174a4e478 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	honnef.co/go/tools v0.1.3 // indirect
+)
+
+require (
+	cloud.google.com/go/datastore v1.20.0
+	cloud.google.com/go/firestore v1.18.0 // indirect
 	firebase.google.com/go/v4 v4.9.0
-	github.com/stretchr/testify v1.8.0
-	google.golang.org/grpc v1.49.0
-	google.golang.org/protobuf v1.28.1
+	github.com/stretchr/testify v1.11.1
+	google.golang.org/grpc v1.82.1
+	google.golang.org/protobuf v1.36.11
 )