chore(network): bump ethereum reth image to v2.3.0

Bump the execution-client image tag for `obol network install ethereum`
from v2.2.0 to v2.3.0 (latest reth release) and update the partial-archive
comment to match. Generic version bump; no behavior change.

Author: bussyjd

internal/embed/networks/ethereum/helmfile.yaml.gotmpl

@@ -63,7 +63,7 @@ releases:
                     - --full
                     {{- else if eq (index .Values "pruneKind" | default "") "before" }}
                     # Partial archive: keep state, receipts and bodies from
-                    # the requested block forward. Reth v2.2.0 and current
+                    # the requested block forward. Reth v2.3.0 and current
                     # main both support exact .before cutoffs for these
                     # segments, so avoid the coarser pre-merge preset.
                     - --prune.account-history.before={{ .Values.pruneBlock }}