Update mercari grpc-federation plugin (#1681)

plugins/community/mercari-grpc-federation/v1.8.1/.dockerignore

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+*
+!Dockerfile

plugins/community/mercari-grpc-federation/v1.8.1/Dockerfile

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+# syntax=docker/dockerfile:1.12
+FROM --platform=$BUILDPLATFORM golang:1.23.5-bookworm AS build
+
+ARG TARGETOS TARGETARCH
+ENV CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH
+
+RUN --mount=type=cache,target=/go/pkg/mod \
+    go install -ldflags="-s -w" -trimpath github.com/mercari/grpc-federation/cmd/[email protected] \
+ && mv /go/bin/${GOOS}_${GOARCH}/protoc-gen-grpc-federation /go/bin/protoc-gen-grpc-federation || true
+
+FROM scratch
+COPY --from=build --link --chown=root:root /etc/passwd /etc/passwd
+COPY --from=build --link --chown=root:root /go/bin/protoc-gen-grpc-federation .
+ENV GOROOT /
+USER nobody
+ENTRYPOINT [ "/protoc-gen-grpc-federation" ]

plugins/community/mercari-grpc-federation/v1.8.1/buf.plugin.yaml

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+version: v1
+name: buf.build/community/mercari-grpc-federation
+plugin_version: v1.8.1
+source_url: https://github.com/mercari/grpc-federation
+integration_guide_url: https://github.com/mercari/grpc-federation/blob/main/docs/getting_started.md
+description: Generates a gRPC server by writing a custom option in Protocol Buffers
+output_languages:
+  - go
+spdx_license_id: MIT
+license_url: https://github.com/mercari/grpc-federation/blob/v1.8.1/LICENSE

tests/testdata/buf.build/community/mercari-grpc-federation/v1.8.1/eliza/plugin.sum

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+h1:47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=

tests/testdata/buf.build/community/mercari-grpc-federation/v1.8.1/grpc-federation-v1.4.1/plugin.sum

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+h1:+8/Q45+MLFAX3u+Rw8VMqzAtielP1KeiwwgN2wFNOts=

tests/testdata/buf.build/community/mercari-grpc-federation/v1.8.1/petapis/plugin.sum

@@ -0,0 +1 @@
+h1:47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=