Bump mirai version requirement (#1227)

* Bump mirai version requirement

* Update purrr vignette to use synchronous daemons

Author: shikokuchuo

DESCRIPTION

@@ -28,7 +28,7 @@ Suggests:
     httr,
     knitr,
     lubridate,
-    mirai (>= 2.5.0),
+    mirai (>= 2.5.1),
     rmarkdown,
     testthat (>= 3.0.0),
     tibble,

R/parallelization.R

@@ -187,7 +187,7 @@ parallel_pkgs_installed <- function() {
     {
       check_installed(
         c("carrier", "mirai"),
-        version = c("0.3.0", "2.5.0"),
+        version = c("0.3.0", "2.5.1"),
         reason = "for parallel map."
       )
       the$parallel_pkgs_installed <- TRUE

vignettes/purrr.Rmd

@@ -87,8 +87,7 @@ mirai::daemons(6)
 
 ```{r}
 #| echo: false
-# Can be updated to mirai::daemons(sync = TRUE) once mirai >= 2.5.1 is released
-mirai::daemons(1, dispatcher = FALSE)
+mirai::daemons(sync = TRUE)
 ```
 
 (You only need to do this once per session.)
@@ -119,6 +118,11 @@ out <- map(by_cyl, in_parallel(\(df) my_lm(mpg ~ disp, data = df), my_lm = my_lm
 
 Learn more about parallel computing in `?in_parallel`.
 
+```{r}
+#| echo: false
+mirai::daemons(0)
+```
+
 ### Output variants
 
 purrr functions are type-stable, which means it's easy to predict what type of output they return, e.g., `map()` always returns a list. But what if you want a different type of output? That's where the output variants come into play: