fix(integrations): Handle lower-case prefix windows paths in RewriteFrames

[Lms24]

Our previous regex to rewrite windows file paths in stack frames didn't match lower-case c:\\ prefixes. This PR fixes that.

closes#7499

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.49 KB (+0.18% 🔺)
@sentry/browser - ES5 CDN Bundle (minified)	63.56 KB (+0.3% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	19.11 KB (+0.24% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	56.63 KB (+0.36% 🔺)
@sentry/browser - Webpack (gzipped + minified)	21.68 KB (+0.17% 🔺)
@sentry/browser - Webpack (minified)	72.17 KB (+0.28% 🔺)
@sentry/react - Webpack (gzipped + minified)	21.72 KB (+0.18% 🔺)
@sentry/nextjs Client - Webpack (gzipped + minified)	52.06 KB (+0.07% 🔺)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	33.78 KB (+0.11% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	26.14 KB (+0.13% 🔺)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	44 KB (+0.33% 🔺)
@sentry/replay - Webpack (gzipped + minified)	38.07 KB (+0.35% 🔺)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	62.22 KB (+0.27% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	55.3 KB (+0.33% 🔺)