fix: Exclude csproj files from spell-checking#86

Malcolmnixon merged 2 commits intodependabot/nuget/src/DemaConsulting.SpdxModel/production-dependencies-e4989e9b5edemaconsulting/SpdxModel:dependabot/nuget/src/DemaConsulting.SpdxModel/production-dependencies-e4989e9b5efrom

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