doc: change links to https in benchmark guide

PR-URL: #26925
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Signed-off-by: Beth Griggs <Bethany.Griggs@uk.ibm.com>

doc/guides/writing-and-running-benchmarks.md

@@ -470,6 +470,6 @@ Supported options keys are:
 [autocannon]: https://github.com/mcollina/autocannon
 [wrk]: https://github.com/wg/wrk
 [t-test]: https://en.wikipedia.org/wiki/Student%27s_t-test#Equal_or_unequal_sample_sizes.2C_unequal_variances
-[git-for-windows]: http://git-scm.com/download/win
-[nghttp2.org]: http://nghttp2.org
+[git-for-windows]: https://git-scm.com/download/win
+[nghttp2.org]: https://nghttp2.org
 [benchmark-ci]: https://github.com/nodejs/benchmarking/blob/master/docs/core_benchmarks.md