feat: update for coord 1.4 and point tests at main branch (#110)

* feat: update coord to point at main

* test: update to main

* test: change tracking branch to main

* fix: add extra dunder methods needed for coord 1.4

.gitmodules

@@ -5,4 +5,4 @@
 [submodule "tests/Coord"]
 	path = tests/Coord
 	url = https://github.com/LSSTDESC/Coord.git
-	branch = fix-tests-jax-galsim
+	branch = main

jax_galsim/angle.py

@@ -164,6 +164,12 @@ def deg(self):
     def __neg__(self):
         return _Angle(-self._rad)
 
+    def __pos__(self):
+        return self
+
+    def __abs__(self):
+        return _Angle(jnp.abs(self._rad))
+
     def __add__(self, other):
         if not isinstance(other, Angle):
             raise TypeError(