bump parallelproj

- vis. KUL-recon-lab/libparallelproj#21

Author: casperdcl

CHANGES.md

@@ -19,7 +19,7 @@
   - SIRF: 6e429c2d1862057086720c543d220730feb3eecb (2026-05-12)
   - STIR: 6.4.0
   - TomoPhantom: 3.1.4
-  - parallelproj: 2.0.5
+  - parallelproj: 2.0.6
   - CMake: 3.31.12
   - TIGRE: 3.1.3
   - CUDA: 12.9.2

version_config.cmake

@@ -127,7 +127,7 @@ set(DEFAULT_NiftyPET_TAG 70b97da0a4eea9445e34831f7393947a37bc77e7)
 
 ## parallelproj
 set(DEFAULT_parallelproj_URL https://github.com/KUL-recon-lab/libparallelproj)
-set(DEFAULT_parallelproj_TAG v2.0.5)
+set(DEFAULT_parallelproj_TAG v2.0.6)
 
 ## STIR
 # SIRF might work with STIR 6.3.0, but that version has a bug