chore(deps): update consensys/teku docker tag to v25.12.0 (#172)

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

Author: renovate[bot]

charts/dv-pod/templates/statefulset.yaml

@@ -671,7 +671,7 @@ spec:
             - {{ . }}
             {{- end }}
           {{- else if eq .Values.validatorClient.type "teku" }}
-          image: {{ .Values.validatorClient.image.repository | default "consensys/teku" }}:{{ .Values.validatorClient.image.tag | default "25.9.3" }}
+          image: {{ .Values.validatorClient.image.repository | default "consensys/teku" }}:{{ .Values.validatorClient.image.tag | default "25.12.0" }}
           command:
             - /opt/teku/bin/teku
             - validator-client