Remove github repos from pyproject.toml (#419)

Author: sandorkertesz

docs/release_notes/version_0.9_updates.rst

@@ -2,7 +2,7 @@ Version 0.9 Updates
 /////////////////////////
 
 
-Version 0.9.1
+Version 0.9.2
 ===============
 
 Fixes

pyproject.toml

@@ -71,7 +71,7 @@ optional-dependencies.ci = [
 optional-dependencies.dev = [
   "cartopy",
   "cdsapi",
-  "earthkit-data-demo-source @ git+https://github.com/ecmwf/earthkit-data-demo-source",
+  "earthkit-data-demo-source",
   "eccovjson>=0.0.5",
   "ecmwf-api-client>=1.6.1",
   "ecmwf-opendata>=0.3.3",
@@ -113,7 +113,7 @@ optional-dependencies.projection = [
   "cartopy",
 ]
 optional-dependencies.test = [
-  "earthkit-data-demo-source @ git+https://github.com/ecmwf/earthkit-data-demo-source",
+  "earthkit-data-demo-source",
   "nbconvert",
   "nbformat",
   "pytest",