build(deps): bump proc-macro2 from 1.0.75 to 1.0.78

[dependabot[bot]]

Bumps proc-macro2 from 1.0.75 to 1.0.78.

Release notes

Sourced from proc-macro2's releases.

1.0.78

• Expose Span::byte_range (#442)

1.0.77

• Add a function to reset thread-local span data (#438, thanks @​buchgr)

1.0.76

• Work around dead_code warning false positive (#435)

Commits

• d850a1d Release 1.0.78
• 6cefaec Merge pull request #442 from dtolnay/byterange
• 1082767 Expose Span::byte_range
• da1be4d Release 1.0.77
• 69fee37 Merge pull request #440 from dtolnay/example
• 66a3ef0 Raise minimum tested compiler to 1.63
• d2441c3 Add example code for invalidate_current_thread_spans
• 43011bf Ensure invalidate_current_thread_spans has docs even if proc-macro disabled
• 7e7bb0f Improve documentation of invalidate_current_thread_spans
• 64778fc Move invalidate_current_thread_spans to proc_macro2::extra
• Additional commits viewable in compare view

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[mrene]

@dependabot rebase

[dependabot[bot]]

Looks like proc-macro2 is up-to-date now, so this is no longer needed.