fix: bump cowlib

[edgurgel]

What kind of change does this PR introduce?

cowlib 2.16.1 - EEF-CVE-2026-43966 (MEDIUM)
    aka: CVE-2026-43966
    HTTP Response Splitting via Non-VCHAR Bytes in cow_http_struct_hd:escape_string/2
    https://osv.dev/vulnerability/EEF-CVE-2026-43966

cowlib 2.16.1 - EEF-CVE-2026-43969 (LOW)
    aka: CVE-2026-43969, GHSA-g2wm-735q-3f56
    Cookie Request Header Injection via Unvalidated Encoder in cow_cookie:cookie/1
    https://osv.dev/vulnerability/EEF-CVE-2026-43969

https://diff.hex.pm/diff/cowlib/2.16.1..2.18.0

[github-actions]

CRAP Score Report

==> forum
Generated forum app
==> realtime
Compiling 256 files (.ex)
Generated realtime app
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Summary: files=228 functions=1051 scored=1051 worst_score=15944.76

** (Mix) CRAP threshold failed: max_score=30.00
High scores: 28
  lib/extensions/postgres_cdc_rls/subscription_manager.ex Extensions.PostgresCdcRls.SubscriptionManager.handle_info/2 score=37.16
  lib/realtime/adapters/postgres/oid_database.ex Realtime.Adapters.Postgres.OidDatabase.name_for_type_id/1 score=15944.76
  lib/realtime/application.ex Realtime.Application.setup_region_mapping/0 score=47.11
  lib/realtime/nodes.ex Realtime.Nodes.default_region_mapping/1 score=157.20
  lib/realtime/operations.ex Realtime.Operations.rebalance/0 score=42.00
  lib/realtime/operations.ex Realtime.Operations.kill_connections_to_tenant_id/2 score=90.00
  lib/realtime/tenants/connect.ex Realtime.Tenants.Connect.handle_info/2 score=31.86
  lib/realtime_web/channels/auth/jwt_verification.ex RealtimeWeb.JwtVerification.generate_signer/3 score=31.09
  lib/realtime_web/channels/realtime_channel.ex RealtimeWeb.RealtimeChannel.handle_info/2 score=63.44
  lib/realtime_web/channels/realtime_channel.ex RealtimeWeb.RealtimeChannel.handle_in/3 score=144.90
  lib/realtime_web/dashboard/feature_flags.ex RealtimeWeb.Dashboard.FeatureFlags.handle_event/3 score=420.00
  lib/realtime_web/dashboard/node_info.ex RealtimeWeb.Dashboard.NodeInfo.fetch_node_data/2 score=42.00
  lib/realtime_web/dashboard/recon_trace.ex RealtimeWeb.Dashboard.ReconTrace.handle_event/3 score=552.00
  lib/realtime_web/dashboard/recon_trace.ex RealtimeWeb.Dashboard.ReconTrace.handle_info/2 score=210.00
  lib/realtime_web/dashboard/recon_trace.ex RealtimeWeb.Dashboard.ReconTrace.render_value/2 score=42.00
  lib/realtime_web/dashboard/recon_trace.ex RealtimeWeb.Dashboard.ReconTrace.load_module_functions/1 score=42.00
  lib/realtime_web/dashboard/recon_trace.ex RealtimeWeb.Dashboard.ReconTrace.parse_and_start/2 score=110.00
  lib/realtime_web/dashboard/recon_trace.ex RealtimeWeb.Dashboard.ReconTrace.format_value/1 score=702.00
  lib/realtime_web/dashboard/recon_trace.ex RealtimeWeb.Dashboard.ReconTrace.sort_entries/2 score=42.00
  lib/realtime_web/dashboard/recon_trace.ex RealtimeWeb.Dashboard.ReconTrace.parse_module/1 score=90.00
  lib/realtime_web/dashboard/sql_inspector.ex RealtimeWeb.Dashboard.SqlInspector.handle_event/3 score=72.00
  lib/realtime_web/dashboard/sql_inspector.ex RealtimeWeb.Dashboard.SqlInspector.execute_read_only/1 score=72.00
  lib/realtime_web/dashboard/sql_inspector.ex RealtimeWeb.Dashboard.SqlInspector.mask_sensitive_columns/1 score=42.00
  lib/realtime_web/dashboard/sql_inspector.ex RealtimeWeb.Dashboard.SqlInspector.compare_cells/2 score=42.00
  lib/realtime_web/dashboard/sql_inspector.ex RealtimeWeb.Dashboard.SqlInspector.format_cell/1 score=72.00
  lib/realtime_web/dashboard/tenant_migrations.ex RealtimeWeb.Dashboard.TenantMigrations.handle_info/2 score=118.65
  lib/realtime_web/dashboard/tenant_migrations.ex RealtimeWeb.Dashboard.TenantMigrations.run_pgdelta/2 score=61.39
  lib/realtime_web/live/inspector_live/conn_component.ex RealtimeWeb.InspectorLive.ConnComponent.handle_event/3 score=132.00

[coveralls]

Coverage is 91.518% — fix/bump-cowlib into main. No base build found for main.