docs: Update to MicroPython 1.26

Author: jonnor

docs/developing.md

@@ -18,7 +18,7 @@ You will need to have **Python 3.10+ or later** already installed.
 We assume that **micropython** git repository available.
 It is assumed to be at the same level as this repository in the file system.
 If using another location, adjust `MPY_DIR` accordingly.
-You should be using MicroPython 1.25 (or newer).
+You should be using MicroPython 1.26 (or newer).
 
 You should build and install the [MicroPython Unix port](https://github.com/micropython/micropython/blob/master/ports/unix/README.md) to run/test on PC (`micropython` executable).
 

docs/native_modules.rst

@@ -36,6 +36,8 @@ The following is an overview of .mpy ABI version for MicroPython releases.
 +---------------------+---------------+
 | MicroPython version | .mpy version  |
 +=====================+===============+
+| 1.26.x              | 6.3           |
++---------------------+---------------+
 | 1.25.x              | 6.3           |
 +---------------------+---------------+
 | 1.24.x              | 6.3           |

docs/support.rst

@@ -19,7 +19,8 @@ There are no long-term-support or bugfix versions of emlearn-micropython, at thi
 ==================  ======================
 MicroPython         emlearn-micropython
 ==================  ======================
-1.25.x              master
+1.26.x              master
+1.26.x              0.9.x
 1.25.x              0.8.x
 1.24.x              0.7.0
 1.23.x              0.6.0