Remove Cargo.lock

The Cargo.lock file was added only to serve the creation of the Docker
image, as it aided with reproducibility. With Docker support gone, there
is no need for us to manage this file. If users care to use specific
versions of dependencies, they are advised to manage a lock file
themselves.

Author: d-e-s-o

.github/dependabot.yml

@@ -1,4 +1,4 @@
-# Copyright (C) 2023-2024 The cargo-http-registry Developers
+# Copyright (C) 2023-2025 The cargo-http-registry Developers
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 # Please see the documentation for all configuration options:
@@ -17,7 +17,7 @@ updates:
     # lockfile changes could potentially conflict.
     open-pull-requests-limit: 1
     rebase-strategy: auto
-    versioning-strategy: lockfile-only
+    versioning-strategy: auto
     directory: /
     schedule:
       interval: daily

CHANGELOG.md

@@ -1,6 +1,7 @@
 Unreleased
 ----------
 - Removed `Dockerfile` and Docker image build CI job
+- Removed `Cargo.lock` file from repository
 - Bumped `git2` dependency to `0.20`