npsim: new version 1.2.0 (#512)

### Briefly, what does this PR introduce?
This new version introduces the specific detector thresholds as set in
eic/npsim#9.

### What kind of change does this PR introduce?
- [ ] Bug fix (issue #__)
- [x] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __

### Please check if this PR fulfills the following:
- [ ] Tests for the changes have been added
- [ ] Documentation has been added / updated
- [ ] Changes have been communicated to collaborators @kkauder 

### Does this PR introduce breaking changes? What changes might users
need to make to their code?
No.

### Does this PR change default behavior?
No.

packages/npsim/package.py

@@ -17,6 +17,10 @@ class Npsim(CMakePackage):
     maintainers = ["wdconinc"]
 
     version("main", branch="main")
+    version(
+        "1.2.0",
+        sha256="2a7e039dfcf8ed4c8a22fc9cb00bf73859537b3ee83a5bb128cc1ef451763865",
+    )
     version(
         "1.1.1",
         sha256="d1a34efd22832f0da863e5712d342153ca63520acccf9516b47ff3cb2ed4e935",