NEWS.md: add release notes for flux-sched v0.31.0

Problem: There are no release notes for v0.31.0. Add a section to NEWS.md with release notes for v0.31.0.
flux-framework · Dec 13, 2023 · f748fa3 · f748fa3
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+flux-sched version 0.31.0 - 2023-12-12
+--------------------------------------
+
+### New Features
+
+ * resource: add a set-status RPC for marking vertices up/down (#1110)
+
+### Testsuite
+
+ * fix race conditions in t4011-match-duration.t (#1109)
+
+
 flux-sched version 0.30.0 - 2023-11-07
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