Bump Google.Protobuf from 3.12.4 to 3.15.5 in /dotnet-etcd

[dependabot]

Bumps Google.Protobuf from 3.12.4 to 3.15.5.

Release notes

Sourced from Google.Protobuf's releases.

Protocol Buffers v3.15.5

Ruby

• Fixed quadratic memory use in array append (#8379)

PHP

• Fixed quadratic memory use in array append (#8379)

C++

• Do not disable RTTI by default in the CMake build (#8377)

Protocol Buffers v3.15.4

Ruby

• Fixed SEGV when users pass nil messages (#8363)
• Fixed quadratic memory usage when appending to arrays (#8364)

C++

• Create a CMake option to control whether or not RTTI is enabled (#8361)

PHP

• read_property() handler is not supposed to return NULL (#8362)

Protocol Buffers v3.15.3

Ruby

• Ruby <2.7 now uses WeakMap too, which prevents memory leaks. (#8341)

Protocol Buffers v3.15.2

Ruby

• Fix for FieldDescriptor.get(msg) (#8330)

C++

• Fix PROTOBUF_CONSTINIT macro redefinition (#8323)

Protocol Buffers v3.15.1

Ruby

• Bugfix for Message.[] for repeated or map fields (#8313)
• Fix for truncating behavior when converting Float to Duration (#8320)

C++

• Small fixes for MinGW and for C++20 with GCC (#8318)

Protocol Buffers v3.15.0

Protocol Compiler

• Optional fields for proto3 are enabled by default, and no longer require the --experimental_allow_proto3_optional flag.

C++

• MessageDifferencer: fixed bug when using custom ignore with multiple unknown fields
• Use init_seg in MSVC to push initialization to an earlier phase.
• Runtime no longer triggers -Wsign-compare warnings.

... (truncated)

Commits

• 4fff47a Update protobuf version
• 5702d51 Updated CHANGES.txt and PHP release notes for 3.15.5
• b9a036b Do not disable RTTI by default in the CMake build
• 72b02b5 Merge pull request #8379 from haberman/quadratic-mem-fix
• 9b5e357 Fixed quadratic memory use in array append for PHP and Ruby.
• fd8aabf Update protobuf version
• e5c067f Updated CHANGES.txt and PHP changelog for 3.15.4 release
• aa41d90 read_property() handler is not supposed to return NULL
• cf7d81f Merge pull request #8363 from haberman/ruby-nil-fix
• 7d63b99 Removed compatibility test that tries to append "nil" to repeated field.
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[dependabot]

Dependabot tried to add @shubhamranjan as a reviewer to this PR, but received the following error from GitHub:

POST https://api.github.com/repos/sergey-kucheruk/dotnet-etcd/pulls/20/requested_reviewers: 422 - Reviews may only be requested from collaborators. One or more of the users or teams you specified is not a collaborator of the sergey-kucheruk/dotnet-etcd repository. // See: https://docs.github.com/rest/reference/pulls#request-reviewers-for-a-pull-request

[dependabot]

Superseded by #21.