Update NimBLE-Arduino requirement from ^1.4.3 to ^2.1.0

Updates the requirements on [NimBLE-Arduino](https://github.com/h2zero/NimBLE-Arduino) to permit the latest version.
- [Release notes](https://github.com/h2zero/NimBLE-Arduino/releases)
- [Commits](https://github.com/h2zero/NimBLE-Arduino/commits/267d8a69665ae29532c191438415092cfd1bf9d7)

---
updated-dependencies:
- dependency-name: NimBLE-Arduino
  dependency-type: direct:production
...

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

package.json

@@ -28,7 +28,7 @@
     "ESP32Time": "fbiego/ESP32Time#semver:^2.0.6",
     "OneWireNg": "https://github.com/pstolarz/OneWireNg#semver:^0.13.3",
     "Arduino-Temperature-Control-Library": "milesburton/Arduino-Temperature-Control-Library#semver:^3.9.1",
-    "NimBLE-Arduino": "h2zero/NimBLE-Arduino#semver:^1.4.3",
+    "NimBLE-Arduino": "h2zero/NimBLE-Arduino#semver:^2.1.0",
     "ATC_MiThermometer": "matthias-bs/ATC_MiThermometer#semver:^0.4.2",
     "TheengsDecoder": "theengs/decoder#semver:^1.8.2",
     "Preferences": "vshymanskyy/Preferences#semver:^2.1.0",