Two benchmarks were added:

1) `spdxexp.ValidateLicenses([]string{"MIT”})`
2) `”MIT” == “MIT”`

NOTE: The array `[]string{"MIT”})` is created outside the benchmark loop to avoid it contributing to the benchmark time.

The benchmark and summary will allow us to quantify changes to the algorithm  to help us work to a more efficient and scalable evaluation process.

Allows for before and after comparisons for Satisfies and ValidateLicenses methods.

BEFORE

```
+----------------------------+---------------+-------------------+
| Benchmark ValidateLicenses | ns/op average | Scale (5ns/op=1x) |
+----------------------------+---------------+-------------------+
| MIT                        | ~4577.2 ns/op | ~915x             |
| mit                        | ~4772.5 ns/op | ~954x             |
| Apache-2.0                 | ~3771.4 ns/op | ~754x             |
| Zed                        | ~5625.4 ns/op | ~1,125x           |
| MIT AND Apache-2.0         | ~8173.8 ns/op | ~1,635x           |
| MIT AND Apache-2.0 OR Zed  | ~13,477 ns/op | ~2,695x           |
| GPL-2.0-or-later           | ~4608.5 ns/op | ~922x             |
| GPL-2.0+                   | ~8780.0 ns/op | ~1,756x           |
+----------------------------+---------------+-------------------+

+---------------------------+------------------+----------------------+
| Benchmark Satisfies       | ns/op average    | Scale (1500ns/op=1x) |
+---------------------------+------------------+----------------------+
| MIT                       | ~4,213,130 ns/op | ~2,809x              |
| mit                       | ~4,263,859 ns/op | ~2,843x              |
| Apache-2.0                | ~2,598,757 ns/op | ~1,733x              |
| Zed                       | ~5,607,040 ns/op | ~3,738x              |
| MIT AND Apache-2.0        | ~4,481,596 ns/op | ~2,988x              |
| MIT AND Apache-2.0 OR Zed | ~4,482,058 ns/op | ~2,988x              |
| GPL-2.0-or-later          | ~9,803,113 ns/op | ~6,535x              |
| GPL-2.0+                  | ~9,703,581 ns/op | ~6,469x              |
+---------------------------+------------------+----------------------+
```

AFTER

```
+----------------------------+---------------+-------------------+
| Benchmark ValidateLicenses | ns/op average | Scale (5ns/op=1x) |
+----------------------------+---------------+-------------------+
| MIT                        | ~5.3 ns/op    | ~1.1x             |
| mit                        | ~8.2 ns/op    | ~1.6x             |
| Apache-2.0                 | ~1536.8 ns/op | ~307x             |
| Zed                        | ~3192.3 ns/op | ~638x             |
| MIT AND Apache-2.0         | ~7676.7 ns/op | ~1,535x           |
| MIT AND Apache-2.0 OR Zed  | ~12,745 ns/op | ~2,549x           |
| GPL-2.0-or-later           | ~2267.0 ns/op | ~453x             |
| GPL-2.0+                   | ~12,118 ns/op | ~2,424x           |
+----------------------------+---------------+-------------------+

+---------------------------+------------------+----------------------+
| Benchmark Satisfies       | ns/op average    | Scale (1500ns/op=1x) |
+---------------------------+------------------+----------------------+
| MIT                       | ~1452.5 ns/op    | 1x                   |
| mit                       | ~1495.4 ns/op    | 1x                   |
| Apache-2.0                | ~2430.4 ns/op    | ~1.6x                |
| Zed                       | ~5742.4 ns/op    | ~3.8x                |
| MIT AND Apache-2.0        | ~4,079,706 ns/op | ~2,720x              |
| MIT AND Apache-2.0 OR Zed | ~4,217,486 ns/op | ~2,812x              |
| GPL-2.0-or-later          | ~9,011,721 ns/op | ~6,008x              |
| GPL-2.0+                  | ~9,509,477 ns/op | ~6,340x              |
+---------------------------+------------------+----------------------+
```

benchmark tests for validating MIT license

Replicate work in PR #129 - fix panic in parseWith

Update SPDX license files (2026-02-19 04:43 UTC)

update version to v2.4.0