apacheGH-37329: [Release][Homebrew] Follow directory structure change (…

…apache#37349)

### Rationale for this change

    Before: Formula/apache-arrow-glib.rb
    After:  Formula/a/apache-arrow-glib.rb

### What changes are included in this PR?

Remove `Formula/*/` from `Formula/a/apache-arrow-glib.rb` path to detect formula name. 

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: apache#37329

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>

dev/release/post-13-homebrew.sh

@@ -67,7 +67,7 @@ brew bump-formula-pr \
      apache-arrow-glib
 
 for dependency in $(grep -l -r 'depends_on "apache-arrow"' Formula); do
-  dependency=${dependency#Formula/}
+  dependency=${dependency#Formula/*/}
   dependency=${dependency%.rb}
   if [ ${dependency} = "apache-arrow-glib" ]; then
     continue