update `strata` var to `group_var` (#1246) #3124

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Audit Dependencies 🕵️‍♂️ / oysteR scan 🦪	1m 33s
Coverage 📔 / Coverage 📔	7m 40s
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gitleaks 💧 / gitleaks 💧	7s
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R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio, version latest	1h 17m 27s
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Roxygen 🅾 / Manual pages check 🏁	6m 32s
Spell Check 🆎 / Check spelling 🔠	1m 37s
Version Bump 🤜🤛 / Bump version ⤴	45s
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Coverage 📔 / Publish coverage report 📰	8s
R CMD Check (non-CRAN) 🧬 / Upload build tar.gz	0s
R CMD Check (non-CRAN) 🧬 / Publish JUnit HTML report 📰	6s
R CMD Check 🧬 / Upload build tar.gz	0s
R CMD Check 🧬 / Publish JUnit HTML report 📰	9s
	1h 45m 41s

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