chore: use Patch instead of Update in e2e

[zirain]

2026-01-21T06:36:25.8737660Z     proxy_protocol.go:53: 
2026-01-21T06:36:25.8738928Z         	Error Trace:	/home/runner/work/gateway/gateway/test/e2e/tests/proxy_protocol.go:53
2026-01-21T06:36:25.8741792Z         	            				/home/runner/go/pkg/mod/sigs.k8s.io/gateway-api@v1.4.1/conformance/utils/suite/conformance.go:77
2026-01-21T06:36:25.8744287Z         	            				/home/runner/go/pkg/mod/sigs.k8s.io/gateway-api@v1.4.1/conformance/utils/suite/suite.go:487
2026-01-21T06:36:25.8745573Z         	Error:      	Received unexpected error:
2026-01-21T06:36:25.8748987Z         	            	Operation cannot be fulfilled on backends.gateway.envoyproxy.io "proxy-protocol-backend": the object has been modified; please apply your changes to the latest version and try again
2026-01-21T06:36:25.8762876Z         	Test:       	TestE2E/ProxyProtocol

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✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

Name	Link
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.84%. Comparing base (b8d986c) to head (ec17bc1).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8012      +/-   ##
==========================================
+ Coverage   72.81%   72.84%   +0.02%     
==========================================
  Files         237      237              
  Lines       35623    35623              
==========================================
+ Hits        25938    25948      +10     
+ Misses       7834     7828       -6     
+ Partials     1851     1847       -4     

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[zirain]

another flaky in https://github.com/envoyproxy/gateway/actions/runs/21234888171/job/61104808409?pr=8012:

roundtripper.go:234: 2026-01-22T05:06:13.215740253Z: Sending Request:
        < GET / HTTP/1.1
        < Host: 172.18.0.205
        < User-Agent: Go-http-client/1.1
        < X-Echo-Set-Header: 
        < Accept-Encoding: gzip
        < 
        < 
        
        
    roundtripper.go:262: 2026-01-22T05:06:15.289475007Z: Received Response:
        < HTTP/1.1 503 Service Unavailable
        < Connection: close
        < Content-Length: 19
        < Content-Type: text/plain
        < Date: Thu, 22 Jan 2026 05:06:14 GMT
        < 
        < no healthy upstream
        
        
    http.go:276: 2026-01-22T05:06:15.289582578Z: Response expectation failed for request: {URL: {Scheme:http Opaque: User: Host:172.18.0.205 Path:/ RawPath: OmitHost:false ForceQuery:false RawQuery: Fragment: RawFragment:}, Host: , Protocol: HTTP, Method: GET, Headers: map[X-Echo-Set-Header:[]], UnfollowRedirect: false, Server: , CertPem: <truncated>, KeyPem: <truncated>}  not ready yet: expected status code to be one of [200], got 503. CRes: &{503 19 HTTP/1.1 map[Content-Length:[19] Content-Type:[text/plain] Date:[Thu, 22 Jan 2026 05:06:14 GMT]] <nil> []} (after 18.447789989s)