Degree symbol not appearing in ggplot output using sf file

I saw this thread . There is there is the reference to this stopgap: which did fix the current problem. Is there a more permanent solution?

I am using Windows 11 and :
RStudio 2022.12.0+353 "Elsbeth Geranium" Release (7d165dcfc1b6d300eb247738db2c7076234f6ef0, 2022-12-03) for Windows
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) RStudio/2022.12.0+353 Chrome/102.0.5005.167 Electron/19.1.3 Safari/537.36

Here is what I am getting:

#> Linking to GEOS 3.9.3, GDAL 3.5.2, PROJ 8.2.1; sf_use_s2() is TRUE
#> Attaching package: 'rnaturalearthdata'
#> The following object is masked from 'package:rnaturalearth':
#>     countries110
#> Loading required package: sp
#> rgeos version: 0.6-1, (SVN revision 692)
#>  GEOS runtime version: 3.9.3-CAPI-1.14.3 
#>  Please note that rgeos will be retired during 2023,
#> plan transition to sf functions using GEOS at your earliest convenience.
#>  GEOS using OverlayNG
#>  Linking to sp version: 1.6-0 
#>  Polygon checking: TRUE

s_america<-ne_countries(scale="medium",continent='south america',returnclass="sf")

ggplot() + geom_sf(data = s_america)

Created on 2023-01-26 with reprex v2.0.2