meta-python: depend on core version 12 or higher
meta-python: depend on core version 12 or higher

* python3-pyelftools and python3-pycryptodome(x) recipes were recently
  moved from meta-python to oe-core in:
  https://git.openembedded.org/meta-openembedded/commit/?id=7aee545a61c4f91d5e462d5b46b1b8f9a8bad1e3
  https://git.openembedded.org/meta-openembedded/commit/?id=a8f3c00d8d113b46a49584682e10435157d516ca
* core version was bumped now:
  https://git.openembedded.org/openembedded-core/commit/?id=2d503b27e7c88cee9a37c79c4605c77b11f230b6
* this dependency will make sure that people do upgrade oe-core when they do
  upgrade meta-python past these revisions, so the recipes won't suddenly
  disappear as a bonus they will get slightly newer version which are now
  in oe-core
  python3-pycryptodome(x) from 3.9.4 to 3.9.7:
  https://www.pycryptodome.org/en/latest/src/changelog.html#february-2020
  python2-pyelftools from 0.25 to 0.26:
  https://github.com/eliben/pyelftools/commit/8a40f295bc36f96efeb8633dc4a5314f6077d0bf#diff-e4eb329834da3d36278b1b7d943b3bc9

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>
Reviewed-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>
Signed-off-by: Armin Kuster <525edcd226fb27e7f47fbb319a38fe989c677548@gmail.com>

lgirdk/meta-openembedded,lgirdk/meta-openembedded,lgirdk/meta-openembedded,victronenergy/meta-openembedded,lgirdk/meta-openembedded,victronenergy/meta-openembedded,lgirdk/meta-openembedded,lgirdk/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,lgirdk/meta-openembedded,victronenergy/meta-openembedded