BDLMiner 2.5.1

BDLMiner V2 2.5.1

Fixes from the first days of 2.5.0; settings, mining, screens and web
pages are unchanged and the update installs over WiFi.

• PSRAM is back on the boards that have it. The ESP-IDF rebuilt for 2.5.0 turned
  PSRAM off unless the board file declared it: the M5StickC Plus2 lost its 2 MB and
  could no longer open a secure connection to GitHub (release unavailable: manifest HTTP 0; API HTTP 0, with SSL - Memory allocation failed in the log), so it did not
  update by itself; M5Stack Core2 and Fire, and modules with PSRAM on the headless
  builds, lost theirs too. It is found at start-up again, as up to 2.4.2.
  An M5StickC Plus2 on 2.5.0 must be updated once through its web page (Settings ›
  Firmware update, m5stickc-plus2-firmware.bin of this release); later updates come
  by themselves again.
• Built as C++23 and C23. 2.5.0 announced C++23 but was compiled as C++20 (the
  framework's flags ended with an older standard); the firmware's own code is now C++23
  and its C C23, and the build stops if another standard comes back.
• Clearer TLS failures. On boards with PSRAM, a failed secure connection also logs
  the free PSRAM and its largest block.

Validation

All host, tool and browser tests and every board build pass; the M5StickC Plus2 build
has PSRAM enabled again. The PSRAM fix comes from a Plus2 log on 2.4.2 and 2.5.0; this
release has not yet been run on a Plus2.

What's Changed

• build: C++23 and C23 for real, checked at compile time by @bdlglua in #25
• docs(2.5.0): it was compiled as C++20, not C++23 by @bdlglua in #26
• tls: log PSRAM next to the internal heap on failed handshakes by @bdlglua in #27
• 2.5.1: PSRAM back on the boards that can carry it by @bdlglua in #28

Full Changelog: v2.5.0...v2.5.1