Bump github.com/golang/protobuf from 1.0.0 to 1.2.0

[dependabot-preview]

Bumps github.com/golang/protobuf from 1.0.0 to 1.2.0.

Release notes

Sourced from github.com/golang/protobuf's releases.

v1.2.0

Notable changes:

• #605 jsonpb.Unmarshal correctly handles escaped strings for some of the well-known types
• #627 jsonpb.Unmarshal correctly returns an error when trying to marshal a scalar enum into repeated enums.
• #630 jsonpb.Unmarshal correctly handles string versions of numeric primitives
• #644 jsonpb.Unmarshal correctly handles enum values in maps
• #624 fixes a performance regression where nested maps led to quadratic behavior
• #628 reverts strict UTF-8 validation for proto2 string fields
• #660 makes UTF-8 validation errors for proto3 string fields non-fatal

v1.1.0

Notable changes:

• The serialization logic (for both Marshal and Unmarshal) has been optimized. Testing inside Google demonstrate that the new implementation is about 1.3x to 2.1x faster.
• proto3 and unknown fields protocolbuffers/protobuf#272 Unknown fields in proto3 are now preserved.
• #472 JSON marshal and unmarshal now check for proto2 required field.
• #483 GetExtension returns the raw bytes if the ExtensionDesc does not have type information.
• #499 Invalid UTF-8 in string types are rejected during marshal and unmarshal.
• #511 Fields of bad wire types are treated as unknown fields instead of an error.
• #544 The protoc-gen-go generator supports the paths=source_relative option.
• #561 Unknown fields in map entries are now ignored instead of causing an unmarshal error.
• #583 The "import public" feature is now implemented using Go type aliases.

Commits

• aa810b6 proto: fix handling of required fields after multiple violations (#679)
• 20b6e0b Update issue templates
• 89a0c16 README.md: remove usage of group in example (#673)
• 7d1b268 jsonpb: avoid unexported fields in hand-crafted message (#671)
• f5983d5 proto: make invalid UTF-8 errors non-fatal (#660)
• 560bdb6 jsonpb: strictly document JSONPBMarshaler and JSONPBUnmarshaler behavior (#662)
• 11bd559 proto: revert strict erroring of deterministic and custom marshalers (#658)
• 93b26e6 protoc-gen-go: refactor generator by splitting up generateMessage (#657)
• 427e165 proto: fix and cleanup test for deterministic marshal with custom marshalers ...
• 14aad3d jsonpb: avoid copying string-valued map-keys (#654)
• Additional commits viewable in compare view

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[dependabot-preview]

Looks like github.com/golang/protobuf is up-to-date now, so this is no longer needed.