Bump Testcontainers from 4.2.0 to 4.9.0#16

dependabot[bot] wants to merge 1 commit intomasterMLidstrom/DNFileRAG:masterfrom

dependabot/nuget/tests/DNFileRAG.Tests/Testcontainers-4.9.0MLidstrom/DNFileRAG:dependabot/nuget/tests/DNFileRAG.Tests/Testcontainers-4.9.0Copy head branch name to clipboard