Bump adodb/adodb-php from 5.20.14 to 5.20.15

Bumps [adodb/adodb-php](https://github.com/ADOdb/ADOdb) from 5.20.14 to 5.20.15.
- [Release notes](https://github.com/ADOdb/ADOdb/releases)
- [Changelog](https://github.com/ADOdb/ADOdb/blob/master/docs/changelog.md)
- [Commits](ADOdb/ADOdb@v5.20.14...v5.20.15)

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