Update types.py to support Matplotlib <v3.4

[martinvonk]

Short Description

Matplotlib only has FigureBase since >v3.3 so this gives this would give an ImportError if the Matploblib version of the user was <=v3.3. If we want to keep supporting:

pastas/pyproject.toml

Line 25 in 7302511

"matplotlib >= 3.1",

this small change has to be made.

Checklist before PR can be merged:

• closes part of issue [Development] Static type checking and PEP 561 compliance #480

[martinvonk]

Not sure why the tests fail. Locally things seem fine.

[dbrakenhoff]

I think a new version of matplotlib or pandas is causing an issue between the two. Perhaps try updating to the CI versions locally and see if you can run example_uncertainty.py?

[codacy-production]

Coverage summary from Codacy

Merging #553 (96de513) into dev (a37e95c) - See PR on Codacy

Coverage variation	Diff coverage
✅ +0.41% (target: +0.00%)	100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a37e95c)	4888	3493	71.46%
Head commit (96de513)	4888 (+0)	3513 (+20)	71.87% (+0.41%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#553)	8	8	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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