fix the onSchemaChange prop

[thomasheyenbrock]

Fixes #2503

This broke when we introduced the SchemaContextProvider from @graphiql/react in v1.9.3 (see #2420)

[changeset-bot]

🦋 Changeset detected

Latest commit: 900fd2c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
graphiql	Patch
@graphiql/react	Minor

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[github-actions]

The latest changes of this PR are available as canary in npm (based on the declared changesets):

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@graphiql/[email protected]

[codecov]

Codecov Report

Merging #2541 (900fd2c) into main (2d91916) will increase coverage by 3.75%.
The diff coverage is 23.64%.

@@            Coverage Diff             @@
##             main    #2541      +/-   ##
==========================================
+ Coverage   65.70%   69.45%   +3.75%     
==========================================
  Files          85       71      -14     
  Lines        5106     4155     -951     
  Branches     1631     1375     -256     
==========================================
- Hits         3355     2886     -469     
+ Misses       1747     1264     -483     
- Partials        4        5       +1     

Impacted Files	Coverage Δ
packages/codemirror-graphql/src/lint.ts	100.00% <ø> (ø)
packages/codemirror-graphql/src/results/mode.ts	47.05% <ø> (ø)
packages/codemirror-graphql/src/utils/hintList.ts	95.65% <ø> (ø)
...ckages/codemirror-graphql/src/utils/mode-indent.ts	0.00% <0.00%> (ø)
packages/codemirror-graphql/src/variables/mode.ts	79.48% <ø> (ø)
packages/graphiql-react/src/editor/whitespace.ts	100.00% <ø> (ø)
packages/graphiql-react/src/utility/debounce.ts	0.00% <0.00%> (ø)
packages/graphiql-react/src/editor/tabs.ts	5.76% <5.76%> (ø)
packages/codemirror-graphql/src/variables/lint.ts	46.98% <66.66%> (ø)
packages/codemirror-graphql/src/hint.ts	94.73% <100.00%> (ø)
... and 97 more

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