Bump pkg-config from 1.4.7 to 1.5.1

[dependabot[bot]]

Bumps pkg-config from 1.4.7 to 1.5.1.

Changelog

Sourced from pkg-config's changelog.

== 1.5.1 - 2022-11-23

=== Improvements

• Improved the default search path. "/usr" in "/usr/bin/pkg-config" isn't used for buidling the default search path if "pkg-config --variable=pc_path pkg-config" is available. [Reported by Watson][GitHub:#22]

== 1.5.0 - 2022-11-23

=== Improvements

• Improved the default search path. "pkg-config --variable=pc_path pkg-config" is used as the default search path if it's available. [Reported by Watson][GitHub:#22]

== 1.4.9 - 2022-07-31

This is a bug fix release of 1.4.8. All 1.4.8 users should be upgraded to 1.4.9.

=== Fixes

• Fixed a regression bug in 1.4.8 that PkgConfig.have_package can't detect nonexistent package.

== 1.4.8 - 2022-07-30

=== Improvements

• Added support for showing found package version.

Commits

• 20285cd Add 1.5.1 entry
• 236b5ac Don't use parent directory of pkg-config for default path
• ada94f6 Bump version
• 1404c4c Add 1.5.0 entry
• cddb83d Remove needless self.class.send
• ab7a1b6 Use "pkg-config --variable=pc_path pkg-config" as default paths
• 01f24be Bump version
• 1b96489 Add 1.4.9 entry
• 1a77265 Fix a bug that have_package can't detect nonexistent package
• d6cced5 Bump version
• Additional commits viewable in compare view

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This pull request has merge conflicts that must be resolved before it can be merged.