Add release note links for 2023.2 Bobcat (#4)

If any of your deliverables does not have a release note link added
already under deliverables/bobcat, then please check whether there is
an open patch on that repository with the topic "reno-2023.2" [1] still
waiting to be approved.

[1] https://review.opendev.org/q/topic:reno-2023.2+is:open

Change-Id: I5567743a2691f1de598eb592610978d8ec602448

deliverables/bobcat/heat.yaml

@@ -15,3 +15,4 @@ releases:
 branches:
   - name: stable/2023.2
     location: 21.0.0.0rc1
+release-notes: https://docs.openstack.org/releasenotes/heat/2023.2.html

deliverables/bobcat/ironic-inspector.yaml

@@ -27,3 +27,4 @@ branches:
     location: 11.6.0
   - name: stable/2023.2
     location: 11.7.0
+release-notes: https://docs.openstack.org/releasenotes/ironic-inspector/2023.2.html

deliverables/bobcat/ironic-prometheus-exporter.yaml

@@ -18,3 +18,4 @@ releases:
 branches:
   - name: stable/2023.2
     location: 4.2.1
+release-notes: https://docs.openstack.org/releasenotes/ironic-prometheus-exporter/2023.2.html

deliverables/bobcat/osc-placement.yaml

@@ -14,3 +14,4 @@ releases:
 branches:
   - name: stable/2023.2
     location: 4.2.0
+release-notes: https://docs.openstack.org/releasenotes/osc-placement/2023.2.html

deliverables/bobcat/storlets.yaml

@@ -13,3 +13,4 @@ releases:
 branches:
   - name: stable/2023.2
     location: 12.0.0.0rc1
+release-notes: https://docs.openstack.org/releasenotes/storlets/2023.2.html