Package update: KDE Plasma wallpaper crash due to Exiv2 ABI mismatch

**Description:**
After updating Exiv2 to version 0.28.7-1.1, the KDE Plasma wallpaper module (`kcm_wallpaper`) causes `systemsettings` to crash. The root cause is an **ABI mismatch between Exiv2 0.28.7-1.1 and libKExiv2Qt6**.

`libKExiv2Qt6`, used by the wallpaper module, expects the previous ABI of Exiv2, leading to **segfault** and **double free** errors.

---

**Steps to reproduce:**

1. Install Exiv2 0.28.7-1.1 on a CachyOS system with KDE Plasma.
2. Open `systemsettings`.
3. Navigate to the Wallpaper module.
4. Observe the crash.

---

**Temporary workaround:**

- Downgrade Exiv2 to 0.28.5-1
- Or apply wallpapers via CLI:

```bash
plasma-apply-wallpaperimage ~/path/to/image.jpg
```

**Permanent fix:**
Rebuild `libKExiv2Qt6` against the installed version of Exiv2.
```bash
git clone https://invent.kde.org/graphics/libkexiv2.git
cd libkexiv2
mkdir build && cd build
cmake .. -DCMAKE_INSTALL_PREFIX=/usr
make -j$(nproc)
sudo make install
```
---

**Additional context / Logs:**

- GDB backtrace shows crash in `Exiv2::ExifKey::clone()`
- Related discussion: [Exiv2 issue #3386](https://github.com/Exiv2/exiv2/issues/3386)

**Notes:**
This affects all CachyOS users running KDE Plasma with Exiv2 0.28.7-1.1. Updating the `libKExiv2Qt6` package in the repositories or providing rebuild instructions until the next release would prevent crashes for users.