build: commit the lock file

cargo 1.82 has no MSRV-aware resolution, so a dependency publishing a
release that needs a newer toolchain would break the build on a change
that touched nothing. Pinning the resolution makes builds reproducible.

Consumers ignore the lock file of a dependency, so this constrains
nothing downstream. Committing it for libraries is the current cargo
recommendation.

.gitignore

@@ -14,4 +14,3 @@
 /target/
 /libvlc-sys/target
 /xtask/target
-/Cargo.lock

Cargo.lock

@@ -0,0 +1,74 @@
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+# It is not intended for manual editing.
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+
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