pyproject.toml: make pynrfjprog an optional dependencies

Author: lschuermann

pyproject.toml

@@ -16,7 +16,6 @@ dependencies = [
     "crcmod >= 1.7",
     "ecdsa >= 0.19.1",
     "pycryptodome >= 3.15.0",
-    "pynrfjprog >= 10.19.0",
     "pyserial >= 3.0.1",
     "siphash >= 0.0.1",
     "six >= 1.9.0",
@@ -25,6 +24,11 @@ dependencies = [
     "questionary >= 1.10.0",
 ]
 
+[project.optional-dependencies]
+nrfjprog = [
+    "pynrfjprog >= 10.19.0",
+]
+
 [project.urls]
 Home = "https://github.com/tock/tockloader"