Release 0.1.15

[tamnd]

Part of #3.

This is the release 0.1.15, a patch release on the way to M2.

What changes

• CHANGELOG.md has the section 0.1.15 with Add the regular expression functions that find each match #227 and Run set-returning functions in the target list #228.
• cargo xtask version 0.1.15 sets the version of the workspace and the 41 internal pins.
• Cargo.lock and fuzz/Cargo.lock have the new version. No other package changes.

Test

• srvtest passed on server1: fmt, layers, style, clippy, all the workspace tests, the generated file checks and the docs.