ci(node24): pin node24 due to TLS issue with mockttp

[chimurai]

Description

Pin node24 due to TLS issue with mockttp
(httptoolkit/mockttp@b591cff)

Failing CI: https://github.com/chimurai/http-proxy-middleware/actions/runs/17008427489/job/48221187057

Unknown TLS error: Error: C01C4B6E117F0000:error:0A00018D:SSL routines:ssl_add_cert_chain:ca key too small:../deps/openssl/openssl/ssl/statem/statem_lib.c:1079:

    at requestOCSPDone (node:_tls_wrap:324:20)
    at requestOCSP (node:_tls_wrap:274:12)
    at node:_tls_wrap:228:5
    at TLSSocket.SNICallback [as _SNICallback] (/home/runner/work/http-proxy-middleware/http-proxy-middleware/node_modules/mockttp/src/server/http-combo-server.ts:211:21)
    at processTicksAndRejections (node:internal/process/task_queues:105:5) {
  library: 'SSL routines',
  reason: 'ca key too small',
  code: 'ERR_SSL_CA_KEY_TOO_SMALL'
}

at getCauseFromError (node_modules/mockttp/src/server/http-combo-server.ts:131:38)

Motivation and Context

How has this been tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[pkg-pr-new]

npm i https://pkg.pr.new/http-proxy-middleware@1137

commit: 10df4d9

[coveralls]

coverage: 97.129%. remained the same
when pulling 10df4d9 on workaround-ci-mockttp-node24-tls-issue
into e7ae009 on master.