Bump libcnb and libherokubuildpack from 0.6.0 to 0.7.0 (#60)

* Bump libcnb from 0.6.0 to 0.7.0

Bumps [libcnb](https://github.com/heroku/libcnb.rs) from 0.6.0 to 0.7.0.
- [Release notes](https://github.com/heroku/libcnb.rs/releases)
- [Commits](heroku/libcnb.rs@libcnb/v0.6.0...libcnb/v0.7.0)

---
updated-dependencies:
- dependency-name: libcnb
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Bump libherokubuildpack from 0.6.0 to 0.7.0

Bumps libherokubuildpack from 0.6.0 to 0.7.0.

---
updated-dependencies:
- dependency-name: libherokubuildpack
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* `cargo update`

* Bump minimum Rust to 1.60

Since:
- that's what's tested in CI (which uses latest stable)
- it helps remind people to upgrade locally
- libherokubuildpack has a minimum of 1.60 anyway

* Change dependabot to weekly

Since for libcnb* releases we tend to manually trigger anyway,
and weekly reduces the noise over daily slightly (not that there
are many PRs for this repo, but in case that changes in the future).

* Add changelog entry

Since:
- this is a framework change rather than a test/dev dependency
- otherwise the "unreleased" section is empty, which looks stranage
  if a release is performed

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ed Morley <501702+edmorley@users.noreply.github.com>

.github/dependabot.yml

@@ -3,8 +3,8 @@ updates:
   - package-ecosystem: "cargo"
     directory: "/"
     schedule:
-      interval: "daily"
+      interval: "weekly"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "daily"
+      interval: "weekly"

CHANGELOG.md

@@ -1,6 +1,9 @@
 ## Unreleased
 
+- Updated `libcnb` and `libherokubuildpack` from 0.5.0 to 0.7.0 ([#49](https://github.com/heroku/procfile-cnb/pull/49) and [#60](https://github.com/heroku/procfile-cnb/pull/60)).
+
 ## 1.0.1
+
 - Added explicit support for heroku-* stacks.
 
 ## 1.0.0

Cargo.toml

@@ -4,12 +4,12 @@ name = "procfile-buildpack"
 version = "0.0.0"
 publish = false
 edition = "2021"
-rust-version = "1.57"
+rust-version = "1.60"
 
 [dependencies]
 indoc = "1.0.4"
-libcnb = "0.6.0"
-libherokubuildpack = "0.6.0"
+libcnb = "0.7.0"
+libherokubuildpack = "0.7.0"
 linked-hash-map = "0.5.4"
 regex = "1.5.5"
 thiserror = "1.0.30"