bump to 24 6

[saviorand]

This updates the codebase to work with Mojo 24.6.0

Benchmark results with current changes:

Benchmark results
--------------------------------------------------------------------------------
name          , met (ms)    , iters   , min (ms)    , mean (ms)   , max (ms)    , duration (ms)
HeaderEncode  ,     0.002075,   571763,     0.002075,     0.002075,     0.002075,  1186.646000
HeaderParse   ,     0.013825,    87064,     0.013825,     0.013825,     0.013825,  1203.660000
RequestEncode ,     0.014535,    88400,     0.014535,     0.014535,     0.014535,  1284.910000
RequestParse  ,     0.059278,    34772,     0.059278,     0.059278,     0.059278,  2061.219000
ResponseEncode,     0.071990,    59699,     0.071990,     0.071990,     0.071990,  4297.749000
ResponseParse ,     0.241491,    10000,     0.241491,     0.241491,     0.241491,  2414.913000

[saviorand]

What seems to work:

1. Running server with basic handlers, like lightbug.🔥, bench_server.mojo
2. Running benchmark with bench.mojo
3. No compilation errors

Some problems with this PR so far:

1. Tests with magic run test are failing due to some invalid pointer free errors:

/lightbug_http/tests/lightbug_http/test_client.mojo::test_mojo_client_redirect_external_req_302()
src/tcmalloc.cc:302] Attempt to free invalid pointer 0x14360a8d0 
**************************************** Failure: '/lightbug_http/tests/lightbug_http/test_client.mojo::test_mojo_client_redirect_external_req_google()' ********************
Unhandled exception caught during execution
/lightbug_http/tests/lightbug_http/test_client.mojo::test_mojo_client_redirect_external_req_google()
src/tcmalloc.cc:302] Attempt to free invalid pointer 0x1357082a0 

2. When running mojo run client.mojo getting an exception, probably related to 1
3. When running mojo run lightbug.🔥 seeing a lot of "Failed to close connection" logs, looks like from SysConnection.close() method, looks like an issue with external_calls?

[saviorand]

Also , small_time dependency does not have a 24.6 version yet, so had to comment out code related to Cookie expiration date/other datetime.now() usage. Need to make sure this is back before merging this PR

UPD: @thatstoasty was one step ahead of us as usual and dropped a new version today, just fixed this here and added back small_time

[saviorand]

Could the file descriptor issue be related to the symbol clash described by alain on Discord?
https://discord.com/channels/1087530497313357884/1238682851717812245/1320453635251114095

[thatstoasty]

I see you guys are hard at work on 24.6 updates! If there are still some issues when I'm back from vacation I'll try to contribute too!

[saviorand]

I see you guys are hard at work on 24.6 updates! If there are still some issues when I'm back from vacation I'll try to contribute too!

thanks man! I think we'll merge this now, and for remaining fixes/improvements there are a few which we decided to extract into separate issues/PRs, will let you know once those are created