chore(deps): update dependency ops to v2.15.0 [security] (#136)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

charms/worker/k8s/requirements.txt

@@ -3,7 +3,7 @@ charm-lib-interface-external-cloud-provider @ git+https://github.com/charmed-kub
 charm-lib-node-base @ git+https://github.com/charmed-kubernetes/layer-kubernetes-node-base@9b212854e768f13c26cc907bed51444e97e51b50#subdirectory=ops
 charm-lib-reconciler @ git+https://github.com/charmed-kubernetes/charm-lib-reconciler@f818cc30d1a22be43ffdfecf7fbd9c3fd2967502
 cosl==0.0.8
-ops==2.14.1
+ops==2.15.0
 pydantic==1.10.15
 PyYAML==6.0.2
 tomli == 2.0.1