ci: get quarto-web extensions (#128)

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extensions/quarto-extensions.csv

@@ -212,3 +212,7 @@ gadenbuie/quarto-bluesky-comments
 ThinkR-open/quarto-detective
 kazuyanagimoto/quarto-academic-typst
 gwbrck/apa_and_amp
+quarto-ext/quarto-bluesky-comments
+coatless-quarto/colab
+coatless-quarto/stamp
+coatless-quarto/tabby