runtime(vim): Update base-syntax, fix inline Vim9 dict comments at SOL

Match Vim9 comments at start-of-line (no leading whitespace) in
dictionaries, lists and parenthesised expressions and argument lists.

Addresses https://github.com/vim/vim/pull/14975#issuecomment-2832643115

Report and fix by Aliaksei Budavei.

closes: #17211

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/vim9_comment.vim

@@ -55,6 +55,18 @@ echo "TOP"
       \ arg2
 
 
+# Expression comments
+
+var foo = { # comment
+  # comment
+  bar: 42, # comment
+  # comment
+  # comment
+  baz: 42 # comment
+  # comment
+} # comment
+
+
 # Issue: #13047
 
 if !exists(":DiffOrig")
@@ -66,3 +78,15 @@ endif
 # Issue: #11307 and #11560
 
 # This is what we call " blah
+
+
+# PR: #14975
+# https://github.com/vim/vim/pull/14975#issuecomment-2832643115
+
+var d = {
+    a: 0,
+# a ' quote {{{
+#}}}
+b: 0,
+}
+