chore(deps): update curlimages/curl docker tag to v8.6.0 (#599)

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

Author: renovate[bot]

test/e2e/kuttl/assets/manifests.yaml

@@ -94,7 +94,7 @@ spec:
     spec:
       containers:
         - name: test-flagd-endpoint
-          image: curlimages/curl:8.2.1
+          image: curlimages/curl:8.6.0
           args:
             - /bin/sh
             - -ec

test/e2e/kuttl/flagd-disabled/00-install.yaml

@@ -97,7 +97,7 @@ spec:
     spec:
       containers:
         - name: test-flagd-endpoint
-          image: curlimages/curl:8.2.1
+          image: curlimages/curl:8.6.0
           args:
             - /bin/sh
             - -ec