meson: Sync subproject version numbers in packagefiles with their .wrap equivalents

These tell meson which version the `.wrap` file downloads and should therefore always stay in sync.
No dependency is actually being updated here.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34368>

subprojects/packagefiles/proc-macro2/meson.build

@@ -1,7 +1,7 @@
 project(
   'proc-macro2',
   'rust',
-  version : '1.0.56',
+  version : '1.0.86',
   license :'MIT OR Apache-2.0',
 )
 

subprojects/packagefiles/quote/meson.build

@@ -1,7 +1,7 @@
 project(
   'quote',
   'rust',
-  version : '1.0.25',
+  version : '1.0.33',
   license :'MIT OR Apache-2.0',
 )
 

subprojects/packagefiles/syn/meson.build

@@ -1,7 +1,7 @@
 project(
   'syn',
   'rust',
-  version : '2.0.15',
+  version : '2.0.68',
   license :'MIT OR Apache-2.0',
 )
 

subprojects/packagefiles/unicode-ident/meson.build

@@ -1,7 +1,7 @@
 project(
   'unicode-ident',
   'rust',
-  version : '1.0.6',
+  version : '1.0.12',
   license : '(MIT or Apache-2.0) AND Unicode-DFS-2016)',
 )