Update tomlplusplus to slightly after 2.5.0

This issue otherwise breaks compilation under Meson 0.60.0:

https://github.com/marzer/tomlplusplus/issues/121

CHANGELOG.md

@@ -43,7 +43,9 @@ Versioning](https://semver.org/spec/v2.0.0.html).
   use of `patch_directory`.
 - The bitsery wrap dependency was updated to version 5.2.2.
 - The function2 wrap dependency was updated to version 4.2.0.
-- The tomlplusplus wrap dependency was updated to version 2.5.0.
+- The tomlplusplus wrap dependency was updated to slightly after version 2.5.0
+  because of an [issue](https://github.com/marzer/tomlplusplus/issues/121) with
+  their `meson.build` file that breaks compatibility with Meson 0.60.0.
 
 ## [3.6.0] - 2021-10-15
 

subprojects/tomlplusplus.wrap

@@ -1,7 +1,9 @@
 [wrap-git]
 url = https://github.com/marzer/tomlplusplus.git
-# This is tag v2.5.0
-revision = 037bfdd21f794d7212616d5e6f4f8baab543c472
+# This is tag v2.5.0 plus a couple of additional commits because of issues with
+# their meson.build that breaks the build with Meson 0.60
+# https://github.com/marzer/tomlplusplus/issues/121
+revision = 47216c8a73d77e7431ec536fb3e251aed06cc420
 depth = 1
 
 [provide]