http: fix compatibility with fasthttp RoundTripper

[liuzengh]

Combining trpc-go v1.1.0 with mongodb v1.0.0 selects fasthttp v1.51.0 and fails to compile because NewFastHTTPClient assigns a function to HostClient.Transport, which became a RoundTripper interface in fasthttp v1.49.0.

Assign FastHTTPCli directly using its existing RoundTrip implementation, and upgrade fasthttp to v1.52.0 with the required transitive dependencies and checksums.

Validation:

• go test -mod=readonly ./... -count=1 -timeout=5m passed on Go 1.19.13 and Go 1.24.11.
• go build -mod=readonly ./... passed on Go 1.18.10 and Go 1.24.11.
• golangci-lint run --new-from-rev=origin/main --timeout=5m passed.
• A separate consumer importing trpc-go/http and mongodb v1.0.0 built successfully with this branch supplied through a local module replacement.

Fixes #249

RELEASE NOTES: Fix compilation failures when using tRPC-Go with dependencies that select newer fasthttp versions, including mongodb v1.0.0.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.25984%. Comparing base (56cbf53) to head (842c8bd).

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main        #253         +/-   ##
===================================================
- Coverage   85.48709%   85.25984%   -0.22725%     
===================================================
  Files            215         215                 
  Lines          19052       19050          -2     
===================================================
- Hits           16287       16242         -45     
- Misses          2094        2127         +33     
- Partials         671         681         +10     

Flag	Coverage Δ
unittests	85.25984% <100.00000%> (-0.22725%)	⬇️

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[bytethm]

LGTM