Bump DialogHost.Avalonia from 0.7.7 to 0.7.9 #192

Job	Run time
snyk-check-code-linux	0s
build-linux / build	35s
build-windows / build	2m 44s
build-macos / build	42s
test-linux / test (GTiff2Tiles.Tests/GTiff2Tiles.Tests.csproj)	1m 5s
test-macos / test (GTiff2Tiles.Tests/GTiff2Tiles.Tests.csproj)	53s
deploy-binaries-macos	0s
deploy-docker-github-linux	0s
deploy-binaries-linux	0s
deploy-docker-docker-hub-linux	0s
deploy-packages-github-linux	0s
deploy-packages-nuget-linux	0s
deploy-pages-linux	0s
deploy-src-linux	0s
snyk-check-docker-docker-hub-linux	0s
snyk-check-docker-github-linux	0s
test-windows / test (GTiff2Tiles.Tests/GTiff2Tiles.Tests.csproj)	2m 35s
deploy-binaries-windows	0s
	8m 34s

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