chore(deps): bump prost from 0.12.3 to 0.12.6

[dependabot[bot]]

Bumps prost from 0.12.3 to 0.12.6.

Commits

• d42c85e chore: fix prost release script (#1066)
• d43f7e0 chore: Release version 0.12.6 (#1065)
• 4b11315 fix(prost-build): re-export error_message_protoc_not_found, `protoc_from_en...
• 26405ab fix: Duplicate README to fix release (#1052)
• 548739a chore: Release version 0.12.5 (#1050)
• baddf98 fix: include_file should handle proto without package (#1002)
• 1f38ea6 prost-build: CodeGenerator::boxed method (#1019)
• 2308ba4 fix the link and badge for CI (#1049)
• 71b8e8e tests: Remove unused dependencies (#1043)
• 680a2e1 style(prost-build): Consolidate field data into struct (#1017)
• Additional commits viewable in compare view

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