eelsdb blocks requests bugfix

[PauTorru]

Description of the change

A few sentences and/or a bulleted list to describe and motivate the change:

• Added headers to request.get calls to eelsdb

Progress of the PR

• Change implemented (can be split into several points),
• docstring updated (if appropriate),
• update user guide (if appropriate),
• added tests,
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:exspy build of this PR (link in github checks)
• ready for review.

Minimal example of the bug fix or the new feature

from exspy.misc.eels import eelsdb
s = eelsdb.eelsdb(spectrum_type="coreloss",element="O",edge="K")

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.47%. Comparing base (e63bd21) to head (7694c00).
Report is 80 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
+ Coverage   87.77%   88.47%   +0.70%     
==========================================
  Files          67       67              
  Lines        7286     7287       +1     
  Branches     1179     1179              
==========================================
+ Hits         6395     6447      +52     
+ Misses        626      571      -55     
- Partials      265      269       +4     

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[ericpre]

pre-commit.ci autofix

[ericpre]

Can you add a changelog entry as described in the pull request template:
https://github.com/hyperspy/exspy/blob/main/.github/PULL_REQUEST_TEMPLATE.md

[PauTorru]

Can you add a changelog entry as described in the pull request template: https://github.com/hyperspy/exspy/blob/main/.github/PULL_REQUEST_TEMPLATE.md

Like so? I edited first coment

[ericpre]

For the changelog entry, you need to add a rst file summarising the changes and with the correct name. This is explained in more detailed in upcoming_changes/README.rst.

Here is an example of a commit adding a changelog entry: bae3882

The template is here as a guideline, which explains the main steps for contributors to know what they need to do but also as a reminder / check list (including experienced contributors 😄).

[PauTorru]

I think I got it now. Easy to tell it was my first contribution. 😅

[ericpre]

Thank you @PauTorru.
There are a number of things to figure out when contributing the first time and it is not always easy to appreciate what is necessary or not, its relevance, etc.! :)