NEWS.md: add release notes for v0.33.1

Problem: there are no release notes for version 0.33.1.

Add them.

NEWS.md

@@ -1,3 +1,15 @@
+flux-sched version 0.33.1 - 2024-04-09
+--------------------------------------
+
+### Fixes
+
+ * Improve match performance with node constrains when feasibility is
+   enabled (#1162)
+ * policies: add firstnodex to the known policies (#1161)
+ * reader: fix jgf properties (#1149)
+ * Replace deprecated 'flux job cancel[all]' usage (#1157)
+ * Corrects typo 'becuase' into 'because'.  (#1155)
+
 flux-sched version 0.33.0 - 2024-03-04
 --------------------------------------