Update test/*.min_frontend for several vibe.d tests to 2.077 ...

Vibe.d officially stopped supporting DMDFE 2.076.0 as of:
https://github.com/vibe-d/vibe.d/commit/4755eb4980e543f1de9d542f4f0e2caf0d6a2306

While vibe.d didn't break compatibility immediately, the latest release
fails to build with DMD 2.076, which causes pull requests to fail. This
commit bumps the min_frontend in several tests that use vibe.d to
reflect this.

Fix travis ci