Update pytest-bdd to v8.0 (#1955)

* Encapsulate all multiline strings in triple-quotes in Gherkin files

Since pytest-bdd v8.0.0 uses the official Gherkin parser, multiline
strings must now be encapsulated by triple-quotes.

See:
- https://pytest-bdd.readthedocs.io/en/stable/#id2
- https://pytest-bdd.readthedocs.io/en/stable/#docstrings

* Remove comments in Gherkin files causing test breakage

These comments break the step matching.

* Fix compatibility of step-functions matching on multiple lines

In pytest-bdd v8.0.0 it is no longer possible to match based on multiple
lines, which breaks essentially all steps that support docstrings. Solve
this by adding a wrapper-function for each of these instances, that
matches the docstring step, and calls the original function.

So, what used to be:

    @then(parse("the output should match\n{regex}"))
    @then(parse('the output should match "{regex}"'))
    def output_should_match(regex, cli_run):
        ...

Is now:

    @then(parse("the output should match"))
    def output_should_match_docstring(cli_run, docstring):
        output_should_match(docstring, cli_run)

    @then(parse('the output should match "{regex}"'))
    def output_should_match(regex, cli_run):
        ...

There is possibly a way around this that is much better than what I've
done here, but this is a start at least.

* Update version requirement of pytest-bdd to >=8.0

* Update tox config to match poetry config

---------

Co-authored-by: Micah Jerome Ellison <micah.jerome.ellison@gmail.com>

tests/bdd/features/override.feature

@@ -7,7 +7,9 @@ Feature: Implementing Runtime Overrides for Select Configuration Keys
         Given we use the config "basic_encrypted.yaml"
         And we use the password "test" if prompted
         When we run "jrnl --config-override editor ''" and type
-          This is a journal entry
+            """
+            This is a journal entry
+            """
         Then the stdin prompt should have been called
         And the editor should not have been called
         When we run "jrnl -1"
@@ -27,6 +29,7 @@ Feature: Implementing Runtime Overrides for Select Configuration Keys
         And we use the password "test" if prompted
         When we run "jrnl  -2 --config-override linewrap 23 --format fancy"
         Then the output should be
+            """
             ┎─────╮2013-06-09 15:39
             ┃ My  ╘═══════════════╕
             ┃ fir st  ent ry.     │
@@ -40,6 +43,7 @@ Feature: Implementing Runtime Overrides for Select Configuration Keys
             ┠╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
             ┃ But I'm better.     │
             ┖─────────────────────┘
+            """
 
 
         Scenario: Override color selections with runtime overrides
@@ -59,12 +63,14 @@ Feature: Implementing Runtime Overrides for Select Configuration Keys
         And we use the password "test" if prompted
         When we run "jrnl -1 --config-override colors.body green --config-override editor 'nano'"
         Then the config in memory should contain
+            """
             editor: nano
             colors:
                 title: none
                 body: green
                 tags: none
                 date: none
+            """
 
 
         Scenario: Override default journal
@@ -74,6 +80,7 @@ Feature: Implementing Runtime Overrides for Select Configuration Keys
         Then we should get no error
         When we run "jrnl -3 --config-override journals.default features/journals/simple.journal"
         Then the output should be
+            """
             2000-03-20 09:00 The rain in Spain comes from clouds
 
             2013-06-09 15:39 My first entry.
@@ -81,6 +88,7 @@ Feature: Implementing Runtime Overrides for Select Configuration Keys
 
             2013-06-10 15:40 Life is good.
             | But I'm better.
+            """
 
 
         Scenario: Make an entry into an overridden journal
@@ -91,6 +99,7 @@ Feature: Implementing Runtime Overrides for Select Configuration Keys
         And the output should contain "Entry added"
         When we run "jrnl --config-override journals.temp features/journals/simple.journal temp -3"
         Then the output should be
+            """
             1969-09-06 09:00 @say Ni
 
             2013-06-09 15:39 My first entry.
@@ -98,3 +107,4 @@ Feature: Implementing Runtime Overrides for Select Configuration Keys
 
             2013-06-10 15:40 Life is good.
             | But I'm better.
+            """