Update vimeo/psalm requirement from ^4.18 to ^5.1

[dependabot[bot]]

Updates the requirements on vimeo/psalm to permit the latest version.

Release notes

Sourced from vimeo/psalm's releases.

5.1.0

What's Changed

Deprecations

• Defer cache directory creation until it's needed by @​weirdan in vimeo/psalm#8789

Features

• check "never" return type more strictly by @​kkmuffme in vimeo/psalm#8624
• Report by issues grouped by level and type by @​bdsl in vimeo/psalm#8774

Fixes

• Ignore non-existing classes during initial scan of intersection types by @​danog in vimeo/psalm#8794
• handle true/false reconciliation consistently, fix #8795 by @​orklah in vimeo/psalm#8796
• fix sealed combination by @​orklah in vimeo/psalm#8798
• Fix #8806 by @​danog in vimeo/psalm#8809

Docs

• Update installation.md - 5 requires PHP >= 7.4 by @​sasezaki in vimeo/psalm#8805
• Adds documentation for the forbiddenFunctions config option by @​p810 in vimeo/psalm#8808

New Contributors

• @​p810 made their first contribution in vimeo/psalm#8808

Full Changelog: https://github.com/vimeo/psalm/compare/5.0.0...5.1.0

Commits

• 4defa17 Merge pull request #8774 from bdsl/report-by-issue-type-severity
• 1dbdf78 Code style fix
• ad57727 Sort issue by position in codebase in ByIssueLevelAndTypeReport if level & ty...
• a29f65e Fix too lax function visibility in test
• 6693421 Code style fix
• 5423983 Fix error in ByIssueLvelAndTypeReport heading
• 699ee34 Indent heredoc in test
• d6c7c86 Remove unecassary subheadings in error levels documentation
• cd18cdc Re-order list of errors in docs
• 9e63bf6 Minor code edits in ByIssueLevelAndType
• Additional commits viewable in compare view

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[what-the-diff[bot]]

• Update Psalm from 4.18 to 5.1

[dependabot[bot]]

Superseded by #97.