fix proto for 8.1.0beta2

[remicollet]

Without

$ php -n -d extension=raphf -d extension=modules/http.so  -v

Deprecated: Return type of http\Client::attach(SplObserver $observer) should either be compatible with SplSubject::attach(SplObserver $observer): void, or the #[ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in Unknown on line 0

Deprecated: Return type of http\Client::detach(SplObserver $observer) should either be compatible with SplSubject::detach(SplObserver $observer): void, or the #[ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in Unknown on line 0

Deprecated: Return type of http\Client::notify(?http\Client\Request $request = <default>, $progress = <default>) should either be compatible with SplSubject::notify(): void, or the #[ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in Unknown on line 0

With

=====================================================================
TEST RESULT SUMMARY
---------------------------------------------------------------------
Exts skipped    :    0
Exts tested     :  123
---------------------------------------------------------------------

Number of tests :  202               199
Tests skipped   :    3 (  1.5%) --------
Tests warned    :    0 (  0.0%) (  0.0%)
Tests failed    :    0 (  0.0%) (  0.0%)
Tests passed    :  199 ( 98.5%) (100.0%)
---------------------------------------------------------------------
Time taken      :   10 seconds
=====================================================================

[codecov]

Codecov Report

Merging #118 (c3012ed) into master (114dee0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #118   +/-   ##
=======================================
  Coverage   85.41%   85.41%           
=======================================
  Files          42       42           
  Lines        9245     9245           
=======================================
  Hits         7897     7897           
  Misses       1348     1348           

Impacted Files	Coverage Δ
src/php_http_client.c	87.08% <ø> (ø)

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[remicollet]

Sorry, the second commit should have been in a separate commit.... I create mess in my local git...

[m6w6]

Hm... contrary to ignoring E_DEPRECATED, this changes seem to crash with master?