fix(ci): bump wlroots to 0.19.3

[sicelo]

Description

Upgrade to the latest 0.19.x series of wlroots

Test Plan

Works for building and running somewm on my Debian sid machine

sicelo@afrika:~$  dpkg -l libwlroots-0.19
┌── Desired=Unknown/Install/Remove/Purge/Hold
│┌─ Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
││┌ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
│││ Name                  Version      Architecture Description
├┼┼─═════════════════════─════════════─════════════─═══════════════════════════════════════════════════
ii  libwlroots-0.19:amd64 0.19.3-1     amd64        Modular wayland compositor library - shared library
sicelo@afrika:~$  somewm --version
## somewm version info

**somewm:** 2.0.0-dev (unknown)
**wlroots:** 0.19
**Lua:** LuaJIT 2.1.1761786044 (compiled: Lua 5.1.4)
**LGI:** 0.9.2
**Build:** D-Bus=yes, XWayland=yes

**System:**
- Distro: Debian GNU/Linux forky/sid
- Kernel: 7.0.14+deb14-amd64
- Arch: x86_64
- GPU: i915 (8086:7D41)
- Session: wayland (nested: yes)

Checklist

• Lua libraries (lua/awful/, lua/gears/, lua/wibox/, lua/naughty/) are not modified — if a bug surfaces in Lua, the fix belongs in C
• Tests pass (make test-unit && make test-integration)

[JimmyCozza]

Thank you so much for this one.