Update explicitly sized ticks for mark_boxplot after Vega-Lite upgrade.

PiperOrigin-RevId: 947187991

Author: andyl7an

meridian/analysis/visualizer.py

@@ -368,7 +368,13 @@ def plot_rhat_boxplot(self) -> alt.Chart:
 
     boxplot = (
         alt.Chart(rhat, width=c.VEGALITE_FACET_DEFAULT_WIDTH)
-        .mark_boxplot(median={'color': c.BLUE_300}, outliers={'filled': True})
+        .mark_boxplot(
+            size=14,
+            ticks={'size': 14},
+            extent=1.5,
+            median={'color': c.BLUE_300, 'stroke': c.BLUE_300},
+            outliers={'filled': True},
+        )
         .encode(
             x=alt.X(c.PARAMETER, axis=alt.Axis(labelAngle=-45)),
             y=alt.Y(c.RHAT, scale=alt.Scale(zero=False)),

meridian/model/eda/meridian_eda.py

@@ -916,7 +916,7 @@ def _plot_boxplots(
 
       charts.append((
           alt.Chart(plot_data)
-          .mark_boxplot(ticks=True, size=40, extent=1.5)
+          .mark_boxplot(ticks={'size': 40}, size=40, extent=1.5)
           .encode(
               x=alt.X(
                   f'{eda_constants.VARIABLE}:N',