chore(deps): update rust crate proc-macro2 to v1.0.103

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
proc-macro2	dependencies	patch	1.0.102 -> 1.0.103

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Release Notes

dtolnay/proc-macro2 (proc-macro2)

v1.0.103

Compare Source

• Add semver-exempt Literal methods str_value, cstr_value, byte_str_value (#​525)

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[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)