Update bufbuild/py (#2645)

### bufbuild
- py: v0.2.0 → v0.3.0

Co-authored-by: app-token-plugins[bot] <app-token-plugins[bot]@users.noreply.github.com>

Author: app-token-plugins[bot]

plugins/bufbuild/py/v0.3.0/.dockerignore

@@ -0,0 +1,3 @@
+*
+!Dockerfile
+!requirements.txt

plugins/bufbuild/py/v0.3.0/Dockerfile

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+# syntax=docker/dockerfile:1.24
+FROM python:3.13.14-trixie@sha256:54e7879ce487f34f8ee85fc37e7547e843a2358bbcb19ecc273869e9d9fcc7dc AS build
+WORKDIR /app
+RUN python -mvenv /app
+ADD /requirements.txt requirements.txt
+RUN . ./bin/activate \
+ && pip install --no-cache-dir -r requirements.txt \
+ && pip uninstall --yes pip setuptools \
+ && rm -f requirements.txt bin/activate.fish bin/activate.csh bin/Activate.ps1 \
+ && ln -sf /usr/bin/python /app/bin/python
+
+FROM gcr.io/distroless/python3-debian13:latest@sha256:325c8639176419afb9c3b50b420fbbd65d608f85f1e3f38bc4b8ba80aeac2e8d AS base
+
+FROM scratch
+COPY --link --from=base / /
+COPY --link --from=build --chmod=0755 /app /app
+USER nobody
+CMD [ "/app/bin/protoc-gen-py" ]

plugins/bufbuild/py/v0.3.0/buf.plugin.yaml

@@ -0,0 +1,20 @@
+version: v1
+name: buf.build/bufbuild/py
+plugin_version: v0.3.0
+source_url: https://github.com/bufbuild/protobuf-py
+description: Generates idiomatic Python code from Protocol Buffers definitions using protobuf-py.
+spdx_license_id: Apache-2.0
+license_url: https://github.com/bufbuild/protobuf-py/blob/v0.3.0/LICENSE
+output_languages:
+- python
+registry:
+  python:
+    package_type: "runtime"
+    requires_python: ">=3.10"
+    deps:
+      # https://pypi.org/project/protobuf-py/
+      - "protobuf-py>=0.3.0"
+  opts:
+    # Produce PEP 420 namespace packages so the py, grpc-py, and dependency
+    # SDKs for a module can share the same top-level package.
+    - init_files=false

plugins/bufbuild/py/v0.3.0/requirements.txt

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+protoc-gen-py==0.3.0
+protobuf-py==0.3.0

tests/testdata/buf.build/bufbuild/py/v0.3.0/eliza/plugin.sum

@@ -0,0 +1 @@
+h1:85v2ycudxhAhklNngus+wxeJ7ik2w+vkxckBayx3Q3c=

tests/testdata/buf.build/bufbuild/py/v0.3.0/petapis/plugin.sum

@@ -0,0 +1 @@
+h1:vBW2M7QspAmJz+mCPlGEkFgVLiwfly3ZWxhFr9Dsv5E=