FIX: Reset notebook kernel

[kaitj]

Deterministic tractography solutions notebook was causing workflow to fail due to use of a local kernel. Reset it with this PR.

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[jhlegarreta]

Have not tested.

[josephmje]

@kaitj could you try also getting rid of

  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.9"
  }
 },

Just in case the python version listed there also interferes with the Github Actions

[kaitj]

Just in case the python version listed there also interferes with the Github Actions

Done @josephmje (if this is what you meant).

[kaitj]

Should be fixed now.