debug/buildinfo: false positives with external scanners flag for go117 binary in testdata [1.24 backport]

[gopherbot]

@prattmic requested issue #71753 to be considered for backport to the next 1.24 minor release.

@gopherbot Please backport to 1.24. Test binaries trigger overly jumpy security scanners, such as one that makes the golang Docker image incorrectly state it is full of critical security vulnerabilities.

[gopherbot]

Change https://go.dev/cl/651235 mentions this issue: [release-branch.go1.24] debug/buildinfo: base64-encode test binaries

[gopherbot]

Closed by merging CL 651235 (commit e4ef833) to release-branch.go1.24.