Makefile: drop stale grpc@v1.59.0 pin from bootstrap target

[raghavendra-nataraj]

What

Remove the stale go get -u google.golang.org/grpc@v1.59.0 line from the bootstrap target in the Makefile.

Why

• bootstrap is a prerequisite of the generate and pipeline targets.
• The line pins grpc to v1.59.0, added in Update golang.org/x/net #367 when grpc was at v1.59.0, and never updated after go.mod moved to v1.82.1.
• Running make generate / make pipeline therefore downgrades the module's grpc back to v1.59.0 — re-introducing already-remediated CVEs — and gen.sh's trailing go mod tidy persists that downgrade into go.mod / go.sum.

Why removal is safe

• Proto generation does not need the grpc module fetched: rpc/gen_proto.sh generates via --go_out=plugins=grpc:, whose grpc plugin ships inside protoc-gen-go@v1.3.2 (installed by the same bootstrap target).
• The grpc runtime version is governed entirely by go.mod. After this change, bootstrap installs only protoc-gen-go and grpc stays at the go.mod-selected v1.82.1.
• Sibling repos (moc-pkg, moc-sdk-for-go) carry no such grpc pin.

Diff

 bootstrap:
-	GOOS="linux" go get -u google.golang.org/grpc@v1.59.0
 	GOOS="linux" go install github.com/golang/protobuf/protoc-gen-go@v1.3.2

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