[geary/mjog/931-cannot-remove-accounts] build: Bump minimum vala version to 0.48.6

[Michael Gratton <mjog src gnome org>]

commit f6bb718fbb603da991f1284a6baeb2776bc52a8c
Author: Michael Gratton <mike vee net>
Date:   Thu Aug 20 12:34:44 2020 +1000

    build: Bump minimum vala version to 0.48.6
    
    Ensure 3.38 isn't affected by GNOME/vala#995, which causes spurious
    bug reports.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index ad482a1fa..5bcb02d02 100644
--- a/meson.build
+++ b/meson.build
@@ -50,7 +50,7 @@ valac = meson.get_compiler('vala')
 # Required libraries and other dependencies
 #
 
-target_vala = '0.46.2'
+target_vala = '0.48.6'
 target_glib = '2.60.4'
 target_gtk = '3.24.7'
 target_webkit = '2.26'