Revert "More intelligent dependabot behaviour"

This reverts commit dcf6883618.

Will not work due to
https://github.com/dependabot/dependabot-core/issues/10160

.github/dependabot.yml

@@ -4,63 +4,16 @@ updates:
     directory: /
     schedule:
       interval: daily
-  # Cargo major version update notifications (PRs) we always want
   - package-ecosystem: cargo
     directory: /
+    schedule:
+      interval: daily
     ignore:
       - dependency-name: "*"
+        # patch and minor updates don't matter for libraries as consumers of this library build
+        # with their own lockfile, rather than the version specified in this library's lockfile
+        # remove this ignore rule if your package has binaries to ensure that the binaries are
+        # built with the exact set of dependencies and those are up to date.
         update-types:
           - "version-update:semver-patch"
           - "version-update:semver-minor"
-    schedule:
-      # we want to know about them immediately
-      interval: daily
-    groups:
-      # we group major bumps for dev-dependencies together in case there are
-      # related groups of breaking changes. that _can_ be the case for
-      # production dependencies too, but there one should be more diligent
-      # about each major bump in case it constitutes a breaking change to the
-      # current crate too.
-      major-dev:
-        dependency-type: "development"
-        update-types:
-          - "major"
-  # patch and minor updates don't matter for libraries, as consumers of a
-  # library build with their own lockfile, rather than the version specified in
-  # this library's lockfile. so for libraries (which is most crates), we should
-  # never update non-major versions, and so the following rule is disabled by
-  # default.
-  #
-  # if your package has binaries, enable this rule by commenting out the
-  # `open-pull-requests-limit` line. this will open a PR once a month that
-  # effectively runs `cargo update` to ensure that the binaries are built with
-  # the exact set of dependencies and those are up to date.
-  - package-ecosystem: cargo
-    # this rule is disabled by default; comment out this line to re-enable:
-    open-pull-requests-limit: 0
-    directory: /
-    schedule:
-      interval: monthly
-    # select only minor + patch by excluding major. dependabot doesn't appear
-    # to have an include-only rule, so we have to do it by exclusion.
-    ignore:
-      - dependency-name: "*"
-        update-types:
-          - "version-update:semver-major"
-    # never bump the version in `Cargo.toml` for minor/patch upgrades; it
-    # should only change when the major version changes to avoid requiring
-    # downstream packages from also running a `cargo update` (and possibly
-    # bumping MSRV unnecessarily as a result).
-    #
-    # TODO: https://github.com/dependabot/dependabot-core/issues/4009
-    # versioning-strategy: "increase-if-necessary"
-    versioning-strategy: "lockfile-only"
-    groups:
-      # note that since this is perfectly disjoint with the `ignore` rule, all
-      # minor/patch updates will end up in a single group, and thus in a single
-      # PR. grouping all of these together only (generally) works because the
-      # Rust community is fairly good about respecting semver.
-      cargo-update:
-        update-types:
-          - "minor"
-          - "patch"