Update migration script with new open proposal PRs

Add PRs kroxylicious#96, kroxylicious#98, kroxylicious#99, kroxylicious#100, kroxylicious#101, and kroxylicious#103 which were opened
after the initial script was created.

Note: PR kroxylicious#100 is already correctly named (100-sidecar-injection-webhook.md).

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: k-wall

notify-open-prs.sh

@@ -10,7 +10,7 @@
 
 set -e
 
-OPEN_PRS=(70 82 83 85 88 93 94)
+OPEN_PRS=(70 82 83 85 88 93 94 96 98 99 100 101 103)
 
 COMMENT_BODY="Hi! We've updated the proposal numbering system to use PR numbers as proposal identifiers.