chore: fix new clippy warnings causing build errors

[makspll]

Summary

Fixes new clippy errors accumulated from newer rustup versions.

Also finally pin the toolchain so this doesn't happen until explicitly updated

[github-actions]

Bencher Report

Branch	fix/new-clippy-warnings
Testbed	linux-gha

⚠️ WARNING: No Threshold found!

Without a Threshold, no Alerts will ever be generated.

• Latency (nanoseconds (ns))

Click here to create a new Threshold
For more information, see the Threshold documentation.
To only post results if a Threshold exists, set the --ci-only-thresholds flag.

Click to view all benchmark results

Benchmark	Latency	nanoseconds (ns)
component/access Lua	📈 view plot ⚠️ NO THRESHOLD	3,406.30 ns
component/access Rhai	📈 view plot ⚠️ NO THRESHOLD	5,506.20 ns
component/get Lua	📈 view plot ⚠️ NO THRESHOLD	2,017.40 ns
component/get Rhai	📈 view plot ⚠️ NO THRESHOLD	4,296.50 ns
conversions/Mut::from	📈 view plot ⚠️ NO THRESHOLD	81.08 ns
conversions/Ref::from	📈 view plot ⚠️ NO THRESHOLD	77.88 ns
conversions/ScriptValue::List	📈 view plot ⚠️ NO THRESHOLD	260.29 ns
conversions/ScriptValue::Map	📈 view plot ⚠️ NO THRESHOLD	1,243.50 ns
conversions/ScriptValue::Reference::from_into	📈 view plot ⚠️ NO THRESHOLD	25.56 ns
conversions/Val::from_into	📈 view plot ⚠️ NO THRESHOLD	265.36 ns
function/call 4 args Lua	📈 view plot ⚠️ NO THRESHOLD	1,666.70 ns
function/call 4 args Rhai	📈 view plot ⚠️ NO THRESHOLD	1,326.00 ns
function/call Lua	📈 view plot ⚠️ NO THRESHOLD	224.43 ns
function/call Rhai	📈 view plot ⚠️ NO THRESHOLD	449.84 ns
loading/empty Lua	📈 view plot ⚠️ NO THRESHOLD	92,922.00 ns
loading/empty Rhai	📈 view plot ⚠️ NO THRESHOLD	1,075,300.00 ns
math/vec mat ops Lua	📈 view plot ⚠️ NO THRESHOLD	6,693.10 ns
math/vec mat ops Rhai	📈 view plot ⚠️ NO THRESHOLD	6,046.90 ns
query/10 entities Lua	📈 view plot ⚠️ NO THRESHOLD	18,778.00 ns
query/10 entities Rhai	📈 view plot ⚠️ NO THRESHOLD	19,481.00 ns
query/100 entities Lua	📈 view plot ⚠️ NO THRESHOLD	38,064.00 ns
query/100 entities Rhai	📈 view plot ⚠️ NO THRESHOLD	31,575.00 ns
query/1000 entities Lua	📈 view plot ⚠️ NO THRESHOLD	241,620.00 ns
query/1000 entities Rhai	📈 view plot ⚠️ NO THRESHOLD	152,000.00 ns
reflection/10 Lua	📈 view plot ⚠️ NO THRESHOLD	5,530.20 ns
reflection/10 Rhai	📈 view plot ⚠️ NO THRESHOLD	15,145.00 ns
reflection/100 Lua	📈 view plot ⚠️ NO THRESHOLD	45,937.00 ns
reflection/100 Rhai	📈 view plot ⚠️ NO THRESHOLD	631,540.00 ns
resource/access Lua	📈 view plot ⚠️ NO THRESHOLD	3,007.80 ns
resource/access Rhai	📈 view plot ⚠️ NO THRESHOLD	4,880.50 ns
resource/get Lua	📈 view plot ⚠️ NO THRESHOLD	1,666.00 ns
resource/get Rhai	📈 view plot ⚠️ NO THRESHOLD	3,682.90 ns

🐰 View full continuous benchmarking report in Bencher