045_proxy is flaky

[dsherret]

https://github.com/denoland/deno/actions/runs/9081191835/job/24954446773

---- run::_045_proxy stdout ----
command D:\a\deno\deno\target\debug\deno.exe run -L debug --allow-net --allow-env --allow-run --allow-read --reload --quiet run/045_proxy_test.ts
command cwd D:\a\deno\deno\tests\testdata
OUTPUT
Proxy server listening on http://localhost:4555/
error: Uncaught (in promise) AssertionError: Values are not equal.


    [Diff] Actual / Expected


-   1
+   0

  throw new AssertionError(message);
        ^
    at assertEquals (file:///D:/a/deno/deno/tests/util/std/assert/assert_equals.ts:52:9)
    at testFetch (file:///D:/a/deno/deno/tests/testdata/run/045_proxy_test.ts:47:3)
    at eventLoopTick (ext:core/01_core.js:168:7)
    at async file:///D:/a/deno/deno/tests/testdata/run/045_proxy_test.ts:116:1

OUTPUT
thread 'run::_045_proxy' panicked at tests\integration\run_tests.rs:237:1: