Add cppcoro for better coroutines prior to C++23

spack.yaml

@@ -8,6 +8,7 @@ spack:
     - cli11@2.1.1
     - cmake@3.24.3
     - cnpy@master
+    - cppcoro@git.10bbcdbf2be3ad3aa56febcf4c7662d771460a99
     - dawn@3_91a
     - dawncut@1_54a
     - dd4hep@1.23 +ddg4 +ddcad +hepmc3 +ipo +lcio
@@ -49,7 +50,6 @@ spack:
     - stow@2.3.1
     - tensorflow-lite@2.8.0 -xnnpack
     - xrootd@5.3.2 cxxstd=17 +python
-    - cppcoro@git.10bbcdbf2be3ad3aa56febcf4c7662d771460a99
   concretizer: 
     unify: true
   packages: