build(deps): bump socket2 from 0.3.12 to 0.3.15

Bumps [socket2](https://github.com/alexcrichton/socket2-rs) from 0.3.12 to 0.3.15.
- [Release notes](https://github.com/alexcrichton/socket2-rs/releases)
- [Commits](https://github.com/alexcrichton/socket2-rs/compare/0.3.12...v0.3.15)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.lock

@@ -1586,9 +1586,9 @@ dependencies = [
 
 [[package]]
 name = "socket2"
-version = "0.3.12"
+version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03088793f677dce356f3ccc2edb1b314ad191ab702a5de3faf49304f7e104918"
+checksum = "b1fa70dc5c8104ec096f4fe7ede7a221d35ae13dcd19ba1ad9a81d2cab9a1c44"
 dependencies = [
  "cfg-if",
  "libc",